Grzegorz Kowal

Pós-doutorado

Formação complementar

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Participação em eventos

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Orientou

Produções bibliográficas

• ABE, S. ; ABHIR, J. ; ABHISHEK, A. ; ACERO, F. ; ACHARYYA, A. ; ADAM, R. ; AGUASCA-CABOT, A. ; AGUDO, I. ; AGUIRRE-SANTAELLA, A. ; ALFARO, J. ; ALFARO, R. ; ALVAREZ-CRESPO, N. ; ALVES BATISTA, R. ; AMANS, J.-P. ; AMATO, E. ; AMBROSI, G. ; ANGEL, L. ; ARAMO, C. ; ARCARO, C. ; Kowal, Grzegorz ; et.al . Dark matter line searches with the Cherenkov Telescope Array. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS , v. 2024, p. 047, 2024.

• ABE, S. ; ABHIR, J. ; ABHISHEK, A. ; ACERO, F. ; ACHARYYA, A. ; ADAM, R. ; AGUASCA-CABOT, A. ; AGUDO, I. ; AGUIRRE-SANTAELLA, A. ; ALFARO, J. ; ALVAREZ-CRESPO, N. ; ALVES BATISTA, R. ; AMANS, J.-P. ; AMATO, E. ; AMBROSI, G. ; AMBROSINO, F. ; ANGÜNER, E.O. ; ARAMO, C. ; ARCARO, C. ; Kowal, Grzegorz ; et.al . Prospects for a survey of the galactic plane with the Cherenkov Telescope Array. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS , v. 2024, p. 081, 2024.

• ABE, K. ; ABE, S. ; ACERO, F. ; ACHARYYA, A. ; ADAM, R. ; AGUASCA-CABOT, A. ; AGUDO, I. ; AGUIRRE-SANTAELLA, A. ; ALFARO, J. ; ALFARO, R. ; ALVAREZ-CRESPO, N. ; ALVES BATISTA, R. ; AMANS, J.-P. ; AMATO, E. ; ANGÜNER, E.O. ; ANTONELLI, L.A. ; ARAMO, C. ; ARAYA, M. ; ARCARO, C. ; Kowal, Grzegorz ; et.al . Prospects for γ-ray observations of the Perseus galaxy cluster with the Cherenkov Telescope Array. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS , v. 2024, p. 004, 2024.

• ACHARYYA, A ; ADAM, R ; AGUASCA-CABOT, A ; AGUDO, I ; AGUIRRE-SANTAELLA, A ; ALFARO, J ; ALOISIO, R ; BATISTA, R ALVES ; AMATO, E ; ANGÜNER, E O ; ARAMO, C ; ARCARO, C ; ASANO, K ; ASCHERSLEBEN, J ; ASHKAR, H ; BACKES, M ; BAKTASH, A ; BALAZS, C ; BALBO, M ; Kowal, Grzegorz ; et.al . Sensitivity of the Cherenkov Telescope Array to TeV photon emission from the Large Magellanic Cloud. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY , v. 623, p. 1576, 2023.

• MEDINA-TORREJÓN, TANIA E. ; E. M. de Gouveia Dal Pino ; Kowal, Grzegorz . Particle Acceleration by Magnetic Reconnection in Relativistic Jets: The Transition from Small to Large Scales. The Astrophysical Journal , v. 952, p. 168, 2023.

• ZHANG, JIAN-FU ; XU, SIYAO ; Lazarian, Alex ; Kowal, Grzegorz . Particle acceleration in self-driven turbulent reconnection. JOURNAL OF HIGH ENERGY ASTROPHYSICS , v. 40, p. 1-10, 2023.

• MEDINA-TORREJÓN, TANIA E. ; de Gouveia Dal Pino, Elisabete M. ; KADOWAKI, LUIS H. S. ; Kowal, Grzegorz ; SINGH, CHANDRA B. ; MIZUNO, YOSUKE . Particle Acceleration by Relativistic Magnetic Reconnection Driven by Kink Instability Turbulence in Poynting Flux-Dominated Jets. The Astrophysical Journal , v. 908, p. 193, 2021.

• Kowal, Grzegorz ; FALCETA-GONÇALVES, DIEGO A. . Colliding-Wind Binaries as a Source of TeV Cosmic Rays. Frontiers in Astronomy and Space Sciences , v. 8, p. 667805-11, 2021.

• NOWAK, NATALIA ; Kowal, Grzegorz ; FALCETA-GONÇALVES, DIEGO A. . Generation and effects of electromotive force in turbulent stochastic reconnection. PHYSICS OF PLASMAS , v. 28, p. 062310, 2021.

• NATIVI, L ; LAMB, G P ; ROSSWOG, S ; LUNDMAN, C ; KOWAL, G . Are interactions with neutron star merger winds shaping the jets?. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY , v. 509, p. 903-913, 2021.

• Lazarian, Alex ; Eyink, Gregory L. ; JAFARI, AMIR ; Kowal, Grzegorz ; LI, HUI ; XU, SIYAO ; Vishniac, Ethan T. . 3D turbulent reconnection: Theory, tests, and astrophysical implications. PHYSICS OF PLASMAS , v. 27, p. 012305, 2020.

• Kowal, Grzegorz ; FALCETA-GONÇALVES, DIEGO A. ; Lazarian, Alex ; Vishniac, Ethan T. . Kelvin-Helmholtz versus Tearing Instability: What Drives Turbulence in Stochastic Reconnection?. The Astrophysical Journal , v. 892, p. 50, 2020.

• NATIVI, L ; BULLA, M ; ROSSWOG, S ; LUNDMAN, C ; KOWAL, G ; GIZZI, D ; LAMB, G P ; PEREGO, A . Can jets make the radioactively powered emission from neutron star mergers bluer?. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY , v. 500, p. 1772-1783, 2020.

• Lazarian, A. ; Kowal, Grzegorz ; XU, SIYAO ; JAFARI, AMIR . 3D Turbulent Reconnection: 20 Years After. JOURNAL OF PHYSICS. CONFERENCE SERIES (ONLINE) , v. 1332, p. 012009, 2019.

• ACHARYYA, A. ; AGUDO, I. ; ANGÜNER, E.O. ; ALFARO, R. ; ALFARO, J. ; ALISPACH, C. ; ALOISIO, R. ; ALVES BATISTA, R. ; AMANS, J.-P. ; AMATI, L. ; AMATO, E. ; AMBROSI, G. ; ANTONELLI, L.A. ; ARAMO, C. ; ARMSTRONG, T. ; ARQUEROS, F. ; ARRABITO, L. ; ASANO, K. ; ASHKAR, H. ; Kowal, Grzegorz ; et.al . Monte Carlo studies for the optimisation of the Cherenkov Telescope Array layout. ASTROPARTICLE PHYSICS , v. 111, p. 35-53, 2019.

• JAFARI, AMIR ; Vishniac, Ethan T. ; Kowal, Grzegorz ; Lazarian, Alex . Stochastic Reconnection for Large Magnetic Prandtl Numbers. The Astrophysical Journal , v. 860, p. 52, 2018.

• Santos-Lima, R. ; de Gouveia Dal Pino, E. M. ; FALCETA-GONÇALVES, D. A. ; Nakwacki, M. S. ; Kowal, G. . Features of collisionless turbulence in the intracluster medium from simulated Faraday rotation maps - II. The effects of instabilities feedback. Monthly Notices of the Royal Astronomical Society (Print) , v. 465, p. 4866-4871, 2017.

• Kowal, Grzegorz ; FALCETA-GONÇALVES, DIEGO A. ; Lazarian, Alex ; Vishniac, Ethan T. . Statistics of Reconnection-driven Turbulence. The Astrophysical Journal Letters , v. 838, p. 91, 2017.

• CAPRONI, ANDERSON ; LANFRANCHI, GUSTAVO AMARAL ; BAIO, GABRIEL HENRIQUE CAMPOS ; Kowal, Grzegorz ; FALCETA-GONÇALVES, DIEGO . Gas Removal in the Ursa Minor Galaxy: Linking Hydrodynamics and Chemical Evolution Models. The Astrophysical Journal Letters , v. 838, p. 99, 2017.

• DEL VALLE, MARIA V. ; de Gouveia Dal Pino, E. M. ; Kowal, G. . Properties of the first-order Fermi acceleration in fast magnetic reconnection driven by turbulence in collisional magnetohydrodynamical flows. Monthly Notices of the Royal Astronomical Society (Print) , v. 463, p. 4331-4343, 2016.

• FALCETA-GONÇALVES, D. ; Kowal, G. . FAST MAGNETIC FIELD AMPLIFICATION IN THE EARLY UNIVERSE: GROWTH OF COLLISIONLESS PLASMA INSTABILITIES IN TURBULENT MEDIA. Astrophysical Journal (Online) , v. 808, p. 65, 2015.

• Lazarian, A. ; EYINK, G. ; VISHNIAC, E. ; Kowal, G. . Turbulent reconnection and its implications. Philosophical Transactions - Royal Society. Mathematical, Physical and Engineering Sciences (Online) , v. 373, p. 20140144-20140144, 2015.

• Nakwacki, M. S. ; Kowal, G. ; Santos-Lima, R. ; de Gouveia Dal Pino, E. M. ; FALCETA-GONÇALVES, D. A. . Features of collisionless turbulence in the intracluster medium from simulated Faraday Rotation maps. Monthly Notices of the Royal Astronomical Society (Print) , v. 455, p. 3702-3723, 2015.

• Falceta Gonçalves, D. A. ; Kowal, G. ; FALGARONE, E. ; CHIAN, A. C.-L. . Turbulence in the interstellar medium. Nonlinear Processes in Geophysics (Online) , v. 21, p. 587-604, 2014.

• CORREIA, C. ; Burkhart, B. ; Lazarian, A. ; OSSENKOPF, V. ; STUTZKI, J. ; KAINULAINEN, J. ; Kowal, G. ; DE MEDEIROS, J. R. . OPACITY BROADENING OF 13 CO LINEWIDTHS AND ITS EFFECT ON THE VARIANCE-SONIC MACH NUMBER RELATION. The Astrophysical Journal. Letters , v. 785, p. L1, 2014.

• Santos-Lima, R. ; de Gouveia Dal Pino, E. M. ; Kowal, G. ; Falceta Gonçalves, D. A. ; Lazarian, A. ; Nakwacki, M. S. . MAGNETIC FIELD AMPLIFICATION AND EVOLUTION IN TURBULENT COLLISIONLESS MAGNETOHYDRODYNAMICS: AN APPLICATION TO THE INTRACLUSTER MEDIUM. THE ASTROPHYSICAL JOURNAL , v. 781, p. 84, 2014.

• Da Silva, G. R. ; Falceta Gonçalves, D. A. ; Kowal, G. ; de Gouveia Dal Pino, E. M. . Ambient magnetic field amplification in shock fronts of relativistic jets: an application to GRB afterglows. Monthly Notices of the Royal Astronomical Society (Print) , v. 446, p. 104-119, 2014.

• Falceta Gonçalves, D. A. ; BONNELL, I. ; Kowal, G. ; Lepine, J. R. D. ; BRAGA, C. A. S. . The onset of large-scale turbulence in the interstellar medium of spiral galaxies. Monthly Notices of the Royal Astronomical Society (Print) , v. 446, p. 973-989, 2014.

• POIDEVIN, FRÉDÉRICK ; Falceta Gonçalves, D. A. ; Kowal, Grzegorz ; de Gouveia Dal Pino, E. M. ; Magalhães, A. M. . MAGNETIC FIELD COMPONENTS ANALYSIS OF THE SCUPOL 850 μm POLARIZATION DATA CATALOG. THE ASTROPHYSICAL JOURNAL , v. 777, p. 112, 2013.

• ACHARYA, B.S. ; ACTIS, M. ; AGHAJANI, T. ; AGNETTA, G. ; AGUILAR, J. ; AHARONIAN, F. ; AJELLO, M. ; AKHPERJANIAN, A. ; ALCUBIERRE, M. ; ALEKSI', J. ; ALFARO, R. ; ALIU, E. ; ALLAFORT, A.J. ; ALLAN, D. ; ALLEKOTTE, I. ; AMATO, E. ; ANDERSON, J. ; ANGÜNER, E.O. ; ANTONELLI, L.A. ; Kowal, Grzegorz ; et.al . Introducing the CTA concept. Astroparticle Physics (Print) , v. 43, p. 3-18, 2013.

• Kowal, Grzegorz ; de Gouveia Dal Pino, E. M. ; Lazarian, A. . Particle Acceleration in Turbulence and Weakly Stochastic Reconnection. Physical Review Letters (Print) , v. 108, p. 241102, 2012.

• KOWAL, G. ; Lazarian, A. ; Vishniac, E. T. ; Otmianowska-Mazur, K. . Reconnection studies under different types of turbulence driving. Nonlinear Processes in Geophysics (Online) , v. 19, p. 297-314, 2012.

• de Gouveia Dal Pino, E. M. ; Leao, M. R. M. ; Santos-Lima, R. ; Guerrero, G. ; Kowal, G ; Lazarian, A. . Magnetic flux transport by turbulent reconnection in astrophysical flows. Physica Scripta (Print) , v. 86, p. 018401, 2012.

• Lazarian, A. ; VLAHOS, L. ; Kowal, G. ; YAN, H. ; Beresnyak, A. ; de Gouveia Dal Pino, E. M. . Turbulence, Magnetic Reconnection in Turbulent Fluids and Energetic Particle Acceleration. Space Science Reviews , v. 173, p. 557-622, 2012.

• Vishniac, E. T. ; PILLSWORTH, S. ; EYINK, G. ; Kowal, G. ; Lazarian, A. ; MURRAY, S. . Reconnection current sheet structure in a turbulent medium. Nonlinear Processes in Geophysics (Online) , v. 19, p. 605-610, 2012.

• Hanasz, M. ; Otmianowska-Mazur, K. ; Lesch, H. ; Kowal, G. ; Soida, M. ; WÓLTA'SKI, D. ; Kowalik, K. ; PAW'ASZEK, R.K. ; Kulesza-Zydzik, B. . Incorporating Cosmic Rays In Local And Global Models Of Disk-Halo Interaction. EAS Publications Series , v. 56, p. 347-354, 2012.

• NAKWACKI, M S ; E. M. de Gouveia Dal Pino ; Kowal, Grzegorz ; SANTOS-LIMA, R . The role of pressure anisotropy in the turbulent intracluster medium. Journal of Physics. Conference Series (Online) , v. 370, p. 012043, 2012.

• Kowal, Grzegorz ; de Gouveia Dal Pino, E. M. ; Lazarian, A. . MAGNETOHYDRODYNAMIC SIMULATIONS OF RECONNECTION AND PARTICLE ACCELERATION: THREE-DIMENSIONAL EFFECTS. The Astrophysical Journal , v. 735, p. 102, 2011.

• Kowal, G ; Falceta Gonçalves, D. A. ; Lazarian, A. . Turbulence in collisionless plasmas: statistical analysis from numerical simulations with pressure anisotropy. New Journal of Physics , v. 13, p. 053001, 2011.

• Kulpa-Dybel, K. ; Otmianowska-Mazur, K. ; Kulesza-Zydzik, B. ; Hanasz, M. ; KOWAL, G. ; Woltanski, D. ; Kowalik, K. . GLOBAL SIMULATIONS OF THE MAGNETIC FIELD EVOLUTION IN BARRED GALAXIES UNDER THE INFLUENCE OF THE COSMIC-RAY-DRIVEN DYNAMO. ASTROPHYS J LETT , v. 733, p. L18, 2011.

• Lazarian, A. ; KOWAL, G. ; Vishniac, E. T. ; de Gouveia Dal Pino, E. M. . Fast magnetic reconnection and energetic particle acceleration. Planetary and Space Science , v. 59, p. 537-546, 2011.

• Kowal, Grzegorz ; Lazarian, A. . VELOCITY FIELD OF COMPRESSIBLE MAGNETOHYDRODYNAMIC TURBULENCE: WAVELET DECOMPOSITION AND MODE SCALINGS. The Astrophysical Journal , v. 720, p. 742-756, 2010.

• Kulpa-Dybel, K. ; KOWAL, G. ; Otmianowska-Mazur, K. ; Lazarian, A. ; Vishniac, E. T. . Reconnection in weakly stochastic -fields in 2D. Astronomy & Astrophysics (Berlin. Print) , v. 514, p. A26, 2010.

• Burkhart, B. ; Stanimirovic, S. ; Lazarian, A. ; Kowal, Grzegorz . CHARACTERIZING MAGNETOHYDRODYNAMIC TURBULENCE IN THE SMALL MAGELLANIC CLOUD. The Astrophysical Journal , v. 708, p. 1204-1220, 2010.

• de Gouveia Dal Pino, E. M. ; KOWAL, G. ; Kadowaki, L. H. S. ; Piovezan, P. ; Lazarian, A. . MAGNETIC FIELD EFFECTS NEAR THE LAUNCHING REGION OF ASTROPHYSICAL JETS. International Journal of Modern Physics D , v. 19, p. 729, 2010.

• Kowal, Grzegorz ; Lazarian, A. ; Vishniac, E. T. ; Otmianowska-Mazur, K. . NUMERICAL TESTS OF FAST RECONNECTION IN WEAKLY STOCHASTIC MAGNETIC FIELDS. The Astrophysical Journal , v. 700, p. 63-85, 2009.

• Kulesza-Zydzik, B. ; Kulpa-Dybel, K. ; Otmianowska-Mazur, K. ; KOWAL, G. ; Soida, M. . Formation of gaseous arms in barred galaxies with dynamically important magnetic field: 3D MHD simulations. Astronomy & Astrophysics (Berlin. Print) , v. 498, p. L21-L24, 2009.

• Hanasz, M. ; Otmianowska-Mazur, K. ; KOWAL, G. ; Lesch, H. . Cosmic-ray-driven dynamo in galactic disks. Astronomy & Astrophysics (Berlin. Print) , v. 498, p. 335-346, 2009.

• Burkhart, B. ; Falceta Gonçalves, D. A. ; KOWAL, G. ; Lazarian, A. . DENSITY STUDIES OF MHD INTERSTELLAR TURBULENCE: STATISTICAL MOMENTS, CORRELATIONS AND BISPECTRUM. The Astrophysical Journal , v. 693, p. 250-266, 2009.

• Otmianowska-Mazur, K. ; Soida, M. ; Kulesza-Zydzik, B. ; Hanasz, M. ; Kowal, Grzegorz . CAN THE COSMIC RAY DRIVEN DYNAMO MODEL EXPLAIN THE OBSERVATIONS OF THE POLARIZED EMISSION OF EDGE-ON GALAXIES?. The Astrophysical Journal , v. 693, p. 1-7, 2009.

• Hill, A. S. ; Benjamin, R. A. ; Kowal, Grzegorz ; Reynolds, R. J. ; Haffner, L. Matthew ; Lazarian, A. . The Turbulent Warm Ionized Medium: Emission Measure Distribution and MHD Simulations. The Astrophysical Journal , v. 686, p. 363-378, 2008.

• Falceta Gonçalves, D. A. ; Kowal, Grzegorz ; Lazarian, A. . Studies of Regular and Random Magnetic Fields in the ISM: Statistics of Polarization Vectors and the Chandrasekharâ¿¿Fermi Technique. Astrophysical Journal (Online) , v. 679, p. 537-551, 2008.

• Kowal, Grzegorz ; Lazarian, A. . Scaling Relations of Compressible MHD Turbulence. The Astrophysical Journal , v. 666, p. L69-L72, 2007.

• KOWAL, G. ; Lazarian, A. ; Beresnyak, A. . Density Fluctuations in MHD Turbulence: Spectra, Intermittency, and Topology. The Astrophysical Journal , v. 658, p. 423-445, 2007.

• Otmianowska-Mazur, K. ; Kowal, Grzegorz ; Hanasz, M. . Discussion of the Electromotive Force Terms in the Model of Parker¿unstable Galactic Disks with Cosmic Rays and Shear. The Astrophysical Journal , v. 668, p. 110-123, 2007.

• KOWAL, G. ; Otmianowska-Mazur, K. ; Hanasz, M. . Dynamo coefficients in Parker unstable disks with cosmic rays and shear. Astronomy & Astrophysics (Berlin. Print) , v. 445, p. 915-929, 2006.

• Otmianowska-Mazur, K. ; KOWAL, G. ; Hanasz, M. . Dynamo coefficients in Parker unstable disks with cosmic rays. Astronomische Nachrichten (Print) , v. 327, p. 477-478, 2006.

• Hanasz, M. ; Otmianowska-Mazur, K. ; KOWAL, G. ; Lesch, H. . Cosmic ray driven dynamo in galactic disks: effects of resistivity, SN rate and spiral arms. Astronomische Nachrichten (Print) , v. 327, p. 469-472, 2006.

• Selwa, M. ; Murawski, K. ; KOWAL, G. . Three-dimensional numerical simulations of impulsively generated MHD waves in solar coronal loops. Astronomy & Astrophysics (Berlin. Print) , v. 422, p. 1067-1072, 2004.

• Hanasz, M. ; KOWAL, G. ; Otmianowska-Mazur, K. ; Lesch, H. . Amplification of Galactic Magnetic Fields by the Cosmic-Ray-driven Dynamo. The Astrophysical Journal , v. 605, p. L33-L36, 2004.

• KOWAL, G. ; Hanasz, M. ; Otmianowska-Mazur, K. . Resistive MHD simulations of the Parker instability in galactic disks. Astronomy & Astrophysics (Berlin. Print) , v. 404, p. 533-543, 2003.

• Lazarian, A. ; Kowal, G. ; Takamoto, M. ; de Gouveia Dal Pino, E. M. ; Cho, J. . Theory and Applications of Non-relativistic and Relativistic Turbulent Reconnection. Astrophysics and Space Science Library. 1ed.: Springer International Publishing, 2016, v. , p. 409-471.

• Lazarian, Alex ; Eyink, Gregory L. ; Vishniac, Ethan T. ; Kowal, Grzegorz . Magnetic Reconnection in Astrophysical Environments. Astrophysics and Space Science Library. 1ed.: Springer Berlin Heidelberg, 2015, v. 407, p. 311-372.

• de Gouveia Dal Pino, E. M. ; Kowal, Grzegorz . Particle Acceleration by Magnetic Reconnection. Astrophysics and Space Science Library. 1ed.: Springer Berlin Heidelberg, 2015, v. 407, p. 373-398.

• Lazarian, Alexandre ; Kowal, Grzegorz ; Pino, B. Gouveia dal ; Vishniac, Ethan T. . Acceleration of Energetic Particles through Reconnection of Weakly Stochastic Magnetic Field. Astrophysics and Space Science Proceedings. 1ed.: Springer Berlin Heidelberg, 2012, v. , p. 11-21.

• de Gouveia Dal Pino, Elisabete M. ; Piovezan, Pamela ; Kowal, Grzegorz ; Lazarian, Alex . Magnetic Reconnection in Accretion Disk Systems: From BHs to YSOs. Astrophysics and Space Science Proceedings. 1ed.: Springer Berlin Heidelberg, 2009, v. , p. 89-95.

• Otmianowska-Mazur, K. ; Hanasz, M. ; Kowal, G. . Calculations of the Dynamo Coefficients in Galactic Magnetic Fields with Shear. How does the Galaxy Work?. 1ed.: Kluwer Academic Publishers, 2004, v. , p. 303-306.

• SINGH, CHANDRA B. ; de Gouveia Dal Pino, Elisabete M. ; KADOWAKI, LUIS H.S. ; MEDINA-TORREJÓN, TANIA E. ; MIZUNO, YOSUKE ; GAROFALO, DAVID ; Kowal, Grzegorz . Magnetic reconnection in jet-accretion disk systems. In: Proceedings of the MG16 Meeting on General Relativity, 2023, Online. The Sixteenth Marcel Grossmann Meeting. p. 344.

• Caproni, A. ; Lanfranchi, G. A. ; BAIO, GABRIEL HENRIQUE CAMPOS ; Falceta Gonçalves, D. A. ; Kowal, G. ; Silva, A. L. . Gas depletion driven by supernovae in dwarf spheroidal galaxy Ursa Minor: hydrodynamical results. In: XV Latin American Regional IAU Meeting, 2017, Cartagena. Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias), 2016. v. 49. p. 175-175.

• de Gouveia Dal Pino, Elisabete ; DEL VALLE, MARIA V. ; Kadowaki, L. H. S. ; Khali, B. ; Kowal, G. ; Mizuno, Y. ; Singh, C. B. . Magnetic Reconnection on Jet-Accretion Disk Systems. In: Frontier Research in Astrophysics II, 2016, Mondello. Proceedings of Science, 2016.

• Lazarian, A. ; Vishniac, E. T. ; Kowal, G. . Model of Reconnection of Weakly Stochastic Magnetic Field and its Testing. In: Numerical Modeling of Space Plasma Flows: ASTRONUM-2008, 2009, St. John, U.S. Virgin Islands. ASP Conference Series, 2008. v. 406. p. 23.

• Hanasz, M. ; Otmianowska-Mazur, K. ; Lesch, H. ; Kowal, G. ; Soida, M. ; Woltanski, D. ; Kowalik, K. ; Pawlaszek, R. ; Kulesza-Zydzik, B. . Cosmic-ray driven dynamo in galactic disks. In: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, 2009, Tenerife. Proceedings of the International Astronomical Union, 2008. v. 259. p. 553-554.

• Kulesza-Zydzik, B. ; Kulpa-Dybel, K. ; Kowal, G. ; Soida, M. . 3D MHD simulations of magnetic fields and radio polarization of barred galaxies. In: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, 2009, Tenerife. Proceedings of the International Astronomical Union, 2008. v. 259. p. 553-554.

• Otmianowska-Mazur, K. ; Kowal, G. ; Lazarian, A. ; Vishniac, E. T. . Effects of turbulence on magnetic reconnection: 3D numerical simulations. In: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies, 2009, Tenerife. Proceedings of the International Astronomical Union, 2008. v. 259. p. 671-674.

• Falceta Gonçalves, D. A. ; Lazarian, A. ; Kowal, G. . Studying ISM magnetic fields and turbulent regimes from polarimetric maps. In: Magnetic Fields in the Universe II: From Laboratory and Stars to the Primordial Universe, 2009, Cozumel. Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias), 2008. v. 36. p. 37-44.

• Kowal, G. ; Lazarian, A. ; Vishniac, E. T. ; Otmianowska-Mazur, K. . Numerical Studies of Weakly Stochastic Magnetic Reconnection. In: Magnetic Fields in the Universe II: From Laboratory and Stars to the Primordial Universe, 2009, Cozumel. Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias), 2008. v. 36. p. 89-96.

• Otmianowska-Mazur, K. ; Hanasz, M. ; Soida, M. ; Kulesza-Zydzik, B. ; Kowal, G. . Polarized Emission of Edge-On Galaxies in Comparisson with the Cosmic-Ray Driven Dynamo Model. In: Magnetic Fields in the Universe II: From Laboratory and Stars to the Primordial Universe, 2009, Cozumel. Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias), 2008. v. 36. p. 266-271.

• Lazarian, A. ; KOWAL, G. ; Beresnyak, A. . Density Statistics of Compressible MHD Turbulence. In: Numerical Modeling of Space Plasma Flows: Astronum-2007, 2008, Paris, France. ASP Conference Series, 2007. v. 385. p. 3-11.

• Kowal, Grzegorz ; Lazarian, A. . Aspects of density fluctuations in compressible MHD turbulence. In: TURBULENCE AND NONLINEAR PROCESSES IN ASTROPHYSICAL PLASMAS; 6th Annual International Astrophysics Conference, 2007, Oahu. AIP Conference Proceedings.

• Hanasz, M. ; Lesch, H. ; Otmianowska-Mazur, K. ; Kowal, G. . Cosmic ray driven dynamo in galactic disks. In: The Magnetized Plasma in Galaxy Evolution, 2005, Kraków. Jagiellonian University. Kraków: Jagiellonian University, 2005. p. 162-170.

• Kowal, G. ; Otmianowska-Mazur, K. ; Hanasz, M. . Calculation of dynamo coefficients in cosmic-ray driven dynamo experiment. In: The Magnetized Plasma in Galaxy Evolution, 2005, Kraków. Jagiellonian University. Kraków: Jagiellonian University, 2005. p. 171-176.

• Selwa, M. ; Murawski, K. ; Kowal, G. ; Nakariakov, V. ; Aschwanden, M. ; Oliver, R. ; Ballester, J. L. . 3D Numerical Simulations of Impulsively Generated MHD Waves in Solar Coronal Loops. In: SOHO 13 - Waves, Oscillations and Small-Scale Transient Events in the Solar Atmosphere: A Joint View from SOHO and TRACE, 2004, Palma de Mallorca. European Space Agency. Noordwijk, The Netherlands: ESA Publications Division, 2004. v. 547. p. 495.

Outras produções

Projetos de pesquisa

• 2022 - Atual

  Interligação entre turbulência, reconexão magnética e produção de raios cósmicos em plasmas astrofísicos não relativísticos e relativísticos, Descrição: A turbulência magnetizada é onipresente nos plasmas astrofísicos e crucial para a formação de estruturas densas e estrelas, a estabilidade de nuvens moleculares, a amplificação de campos magnéticos, a reconexão magnética e a produção e difusão de raios cósmicos. Durante a última década, ficou claro que a cascata de turbulência magnetizada que transfere energia dos movimentos em grande escala para a escala de dissipação não pode ser completamente compreendida sem levar em conta a reconexão magnética, um processo fundamental em plasmas magnetizados responsável por mudanças topológicas de campos e associado à liberação de energia magnética em regiões de aniquilação do campo magnético. Por outro lado, a reconexão magnética na presença de turbulência externa ou autogerada torna-se rápida. Esses fatos indicam uma relação forte e íntima entre esses dois fenômenos e sua importância para a dinâmica dos sistemas astrofísicos. Além disso, eles podem ser responsáveis pela radiação não térmica, atuando como processo de Fermi de primeira ordem, um mecanismo de aceleração capaz de produzir raios cósmicos de alta energia a partir de partículas térmicas em sistemas não relativísticos e relativísticos sem a necessidade da presença de fortes choques. Portanto, uma compreensão profunda desses três fenômenos: turbulência magnetizada, reconexão magnética e aceleração dos raios cósmicos e a interligação entre eles é a chave para entender a dinâmica dos plasmas astrofísicos. Por várias décadas, um esforço significativo foi colocado na compreensão desses fenômenos de forma independente. Nos últimos anos, porém, a comunidade científica tem percebido a importância de se entender a relação entre esses processos. O objetivo deste projeto é realizar um estudo teórico sistemático apoiado em modelagem numérica da interligação entre turbulência, reconexão magnética e produção de raios cósmicos em plasmas não relativísticos e relativísticos, com foco em regimes fortemente e fracamente colisionais, cobrindo a grande maioria de plasmas astrofísicos. Pretendemos investigar o papel das instabilidades na geração de turbulência local, a força e propriedades desta turbulência, seus efeitos na taxa de reconexão global, a eficiência do mecanismo de aceleração baseado na reconexão magnética turbulenta, bem como, as dependências destes processos do plasma-$\beta$, o número de Lundquist e o grau de anisotropia de pressão. As conclusões desses estudos serão aplicadas para entender as medições de satélite das interações entre o vento solar e a magnetosfera, o papel da reconexão turbulenta na dinâmica da coroa solar, o papel da difusão da reconexão magnética no processo de formação estelar, as observações de radiação não térmica em estrelas binárias com ventos em colisão, erupções de raios gama e núcleos galácticos ativos.. , Situação: Em andamento; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Coordenador / Diego Antonio Falceta Gonçalves - Integrante., Financiador(es): Fundação de Amparo à Pesquisa do Estado de São Paulo - Auxílio financeiro.

• 2015 - 2022

  Turbulence and Magnetic reconnection in relativistic astrophysical plasmas: importance for cosmic ray acceleration and propagation in AGNs, GRBs, and Galactic Winds, Descrição: Nowadays in the astrophysical community, the problem of magnetic reconnection is usually studied in the non-relativistic case and approached using two different points of view, on microscopic scales using collisionless kinetic numerical modeling, and on macroscopic scales using magnetohydrodynamical (MHD) fluid approximation, which describes well collisional media. Both approximations have their strong points, but also significant limits, sometimes resulting in separate parameter spaces or different applications. The aim of this project is to extend the magnetic reconnection studies into the relativistic case in both regimes, collisional and collisionless. This requires an extension of our numerical tools, which work well in the classical regime, to include relativistic effects. In the case of MHD we usually apply special relativity, however, for collisionless fluid approximation based on the Chew-Goldberg-Low MHD approximation (CGL-MHD) allowing for the presence of the kinetic instabilities, relativistic version has to be derived. The results obtained with the collisionless approximation can be directly compared with the relativistic Particle-in-Cell (PIC) simulations, using for example a hybrid kinetic-MHD models, which dominate the studies in this regime up to date. As a consequence, this project will allow for getting a deeper insight into the reconnection problem and particle acceleration in most of the physical regimes found in the astrophysical objects, broadening application of magnetic reconnection and related processes in the relativistic regime. These applications in plasma physics cover turbulence generation and its feedback on the reconnection process, magnetic field amplification mechanism, high energetic particle acceleration and propagation, applications in highly relativistic environments, such as active galaxy nuclei and gamma ray burst, where the process of reconnection together with turbulence is expected to be very important in the acceleration of TeV particles. Moreover, the properties of turbulence and reconnection in relativistic environments can also significantly benefit from our studies.. , Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Anderson Caproni - Integrante / Gustavo A. Lanfranchi - Coordenador., Financiador(es): Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Bolsa.

• 2014 - Atual

  Investigation of High Energy and Plasma Astrophysics Phenomena: Theory, Numerical Simulations, Observations, and Instrument Development for the Cherenkov Telescope Array (CTA), Projeto certificado pelo(a) coordenador(a) Elisabete Maria de Gouveia Dal Pino em 06/01/2015., Descrição: The High Energy and Plasma Astrophysics group of E. M. de Gouveia Dal Pino of the Instituto de Astronomia, Geologia e Ciências Atmosféricas da Universidade de São Paulo (IAG-USP), A. B. M. Valio of the Centro de Radioastronomia e Astrofísica da Universidade Mackenzie (CRAAM), and Diego Falceta Goncalves of EACH-USP, have been developing for more than a decade several correlated projects using theoretical and numerical magneto-hydrodynamics (MHD) fluid description, as well as observational tools, to investigate astrophysical plasmas and high energy phenomena. In the recent years, our group has been also involved in the Cherenkov Telescope Array (CTA) Project, an international collaboration (involving 26 countries) aiming the construction of a new generation of ground-based gamma-ray telescopes, between 2016-2020. CTA will provide the deepest ever insight into the non-thermal, high-energy universe and allow significant contributions to cosmology, astroparticle physics and, in particular, to cosmic ray accelerators, cosmic magnetic fields and gamma-ray burst (GRB) investigation. In this proposal we got funding from FAPESP to support the construction of 3 Cherenkov telescopes to complete the ASTRI-CTA Mini-Array, in partnership with INAF- Italy and South-Africa. This Mini-Array of 7 telescopes will be the precursor and the core of the full CTA. The participation in the Mini-Array construction will ensure to the Brazilian members a solid involvement with the CTA Besides, in view of the extensive number of related projects being developed by our group, we also obtained funding to upgrade our computational facilities with a clustar of over 700 cores.. , Situação: Em andamento; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Diego Antonio Falceta Gonçalves - Integrante / Elisabete Maria de Gouveia Dal Pino - Coordenador / Adriana Benetti Marques Válio - Integrante., Financiador(es): Fundação de Amparo à Pesquisa do Estado de São Paulo - Auxílio financeiro.

• 2013 - 2017

  Magnetic Reconnection and Related Processes in Collisional and Collisionless Astrophysical Plasmas: from solar flares to extragalactic sources, Descrição: Nowadays in the astrophysical community, the problem of magnetic reconnection is approached using two different points of view, from the micro-physical scale using collisionless kinetic numerical studies, and from macroscopic magnetohydrodynamical fluid approximation studies, describing well the collisional media. Both approximations have their strong points, but also significant limits, sometimes resulting in separate parameter spaces. There is no real afford taken to understand the bridge between those two approximations applied to the magnetic reconnection problem. The aim of this project is to fill this gap and perform studies which allow to understand the precess of reconnection in both regimes, collisional and collisionless. The collisionless studies, using the Chew-Goldberg-Low magnetohydrodynamics fluid approximation (CGL-MHD) allowing for the presence of the kinetic instabilities, can be directly compared with the Particle-in-Cell (PIC) simulations, using for example a hybrid kinetic-MHD models, which dominate the studies in this regime up to date. As a consequence, the second part of this project will cover the applications of the magnetic reconnection and related processes in both regimes. These applications in plasma physics cover turbulence generation and feedback on the reconnection process, magnetic field amplification mechanism, high energetic particle acceleration. The results have applications in the physics of solar flares, the importance of reconnection in space weather (e.g. interactions with magnetosphere and processes in magnetotail), the interactions of solar magnetic field with the interstellar field in the heliopause, going further up to the scales of active galaxy nuclei and gamma ray burst, where the process of reconnection together with turbulence is expected to be very important in the acceleration of TeV particles. Finally, the properties of turbulence and reconnection in collisionless environments, such intracluster medium, can benefit significantly from our studies.. , Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Coordenador / Diego Antonio Falceta Gonçalves - Integrante., Financiador(es): Fundação de Amparo à Pesquisa do Estado de São Paulo - Auxílio financeiro., Número de produções C, T & A: 14

• 2011 - 2014

  Magnetic Field Effects And Particle Acceleration in Gamma-Ray Bursts (GRBS): Theory, Numerical Simulations, and Observational Prospects, Descrição: Joint Proposal FAPESP-HEBREW University of Jerusalem (HUJ) (process: 2011/51275-4): Supersonic jets are ubiquitous in the Universe as they are associated to a wide variety of astrophysical objects - from young stars to gamma-ray-bursts (GRBs). In particular, GRBs are the most energetic and probably most mysterious phenomena in the cosmos and in this joint Proposal with Prof. T. Piran of HUJ, one of the most prominent experts in the world in GRBs theory, we aim to investigate several aspects of the physics of the ultrarelativistic jets associated to GRBs. In this context, we plan to study: magnetic field reconnection, magnetic turbulence, MHD dynamics of jets, and particle acceleration by collisionless magnetized shocks and by magnetic reconnection within the relativistic regime. This project will maximize the synergy between the two groups. The research will involve both analytic techniques and numerical simulations. It will also involve analysis of astronomical satellite data concerning GRBs and the possibility to make theoretical predictions for the coming CTA (Cherenkov Telescope Array) gamma-ray observatory.. , Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Elisabete Maria de Gouveia Dal Pino - Coordenador / Tsvi Piran - Integrante., Financiador(es): Fundação de Amparo à Pesquisa do Estado de São Paulo - Auxílio financeiro., Número de produções C, T & A: 2

• 2009 - 2013

  Um cluster de computadores para o departamento de Astronomia do IAG/USP e para o núcleo de Astrofísica Teórica da UNICSUL, Projeto certificado pelo(a) coordenador(a) Elisabete Maria de Gouveia Dal Pino em 06/01/2015., Descrição: O projeto enquadra-se no Programa Equipamentos Multiusuários da FAPESP e destina-se à aquisição de um super-cluster para o Departamento de Astronomia e também para o Núcleo de Astrfíscia da UnicSul destinado sobretudo à realização de modelagem numérica de fontes e meios astrofísicos.. , Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Diego Antonio Falceta Gonçalves - Integrante / Elisabete Maria de Gouveia Dal Pino - Coordenador / Alex Cavaliéri Carciofi - Integrante / Paula Rodrigues Teixeira Coelho - Integrante / Beatriz Leonor Silveira Barbuy - Integrante., Financiador(es): Fundação de Amparo à Pesquisa do Estado de São Paulo - Auxílio financeiro.

• 2009 - 2012

  Fast Magnetic Reconnection and Particle Acceleration in Astrophysical Sources and Diffuse Media, Projeto certificado pelo(a) coordenador(a) Elisabete Maria de Gouveia Dal Pino em 06/01/2015., Descrição: One of the fundamental properties of astrophysical magnetic fields is an ability to change their topology through a process known as magnetic reconnection. There is no possible understanding of the origin and evolution of the large-scale magnetic field without understanding the way magnetic field lines change. In a typical astrophysical plasma, magnetic diffusion of the medium is negligible and the so called ?frozen-in? condition is responsible for the change of magnetic topology. Reconnection is essential for understanding a wide variety of astrophysical processes, including stellar and galactic dynamos, astrophysical turbulence and the structure of accretion disks. To account for solar or star flares, the solar cycle, and the structure of the galactic magnetic field, reconnection must be fast, propagating with a speed close to the Alfv ́en speed. Earlier attempts to deal with magnetic reconnection assumed that the magnetized fluids are laminar and as a result they led to slow reconnection rates. The presence of a random magnetic field component substantially enhances the reconnection rate and enables fast reconnection, i.e., reconnection that does not depend on fluid resistivity. The enhancement of the reconnection rate is achieved via a combination of two effects. First of all, only small segments of magnetic field lines are subject to direct Ohmic annihilation. Thus the fraction of magnetic energy that goes directly into fluid heating goes to zero as fluid resistivity vanishes. However, the most important enhancement comes from the fact that unlike the laminar fluid case where reconnection is constrained to proceed line by line, the presence of turbulence enables many magnetic field lines to enter the reconnection zone simultaneously. A significant fraction of magnetic energy goes into MHD turbulence and this enhances reconnection rates through an increase in the field stochasticity. In this way magnetic reconnection becomes fast when field stochasticityaccounted for. As a consequence solar and galactic dynamos are also fast, i.e., do not dependfluid resistivity. Another important issue in reconnection theory is on how the released energy in this process is transformed in heating and particle acceleration. on. , Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Elisabete Maria de Gouveia Dal Pino - Coordenador., Financiador(es): Fundação de Amparo à Pesquisa do Estado de São Paulo - Bolsa., Número de produções C, T & A: 4

• 2005 - 2007

  3D Numerical Models of the Magnetic Field Evolution in Galaxies and Clusters, Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Katarzyna Otmianowska-Mazur - Coordenador / Michał Hanasz - Integrante., Número de produções C, T & A: 1

• 2005 - 2007

  Global Dynamics of the Interstellar Medium, Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Katarzyna Otmianowska-Mazur - Integrante / Michał Hanasz - Coordenador., Número de produções C, T & A: 1

• 2001 - 2004

  Magnetic Fields in Strongly Perturbed Gas Flows, Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Coordenador / Marian Soida - Integrante / Katarzyna Otmianowska-Mazur - Integrante / Marek Urbanik - Integrante., Número de produções C, T & A: 1

• 2001 - 2003

  Parker Instability and Similar Phenomena in Galactic Disks, Situação: Concluído; Natureza: Pesquisa. , Integrantes: Grzegorz Kowal - Integrante / Katarzyna Otmianowska-Mazur - Integrante / Michał Hanasz - Coordenador., Número de produções C, T & A: 1