esfhan Alam Kherani

Pós-doutorado

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Produções bibliográficas

• SANCHEZ, SAUL A. ; KHERANI, ESFHAN A. . A New Analytical Simulation Code of Acoustic-Gravity Waves of Seismic Origin and Rapid Co-Seismic Thermospheric Disturbance Energetics. Atmosphere , v. 15, p. 592, 2024.

• FORNARI, G. ; DE MENESES, F.C. ; ROSA, R.R. ; KHERANI, ESFHAN A. ; DOMINGOS, S. . A methodology for estimating spectral indices to fluctuation measurements of ionospheric parameters. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS , v. 261, p. 106273, 2024.

• SANCHEZ, S. A. ; Kherani, E. A. ; Astafyeva, E. ; de Paula, E. R. . Rapid Detection of Co-Seismic Ionospheric Disturbances Associated With the 2015 Illapel, the 2014 Iquique and the 2011 Sanriku-Oki Earthquakes. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , v. 128, p. e2022JA031231, 2023.

• MALETCKII, B. ; Astafyeva, E. ; SANCHEZ, S. A. ; Kherani, E. A. ; de Paula, E. R. . The 6 February 2023 Türkiye Earthquake Sequence as Detected in the Ionosphere. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , v. 128, p. e2023JA031663, 2023.

• SANCHEZ, SAUL A. ; KHERANI, ESFHAN A. ; ASTAFYEVA, ELVIRA ; DE PAULA, EURICO R. . Ionospheric Disturbances Observed Following the Ridgecrest Earthquake of 4 July 2019 in California, USA. Remote Sensing , v. 14, p. 188, 2022.

• KHERANI, ESFHAN A. ; DE PAULA, EURICO R. . Observations of Quasi-Periodic Electric Field Disturbances in the E Region before and during the Equatorial Plasma Bubble. Atmosphere , v. 12, p. 1106, 2021.

• KHERANI, ESFHAN A. ; SANCHEZ, SAUL A. ; DE PAULA, EURICO R. . Numerical Modeling of Coseismic Tropospheric Disturbances Arising from the Unstable Acoustic Gravity Wave Energetics. Atmosphere , v. 12, p. 765, 2021.

• Abdu, M. A. ; Kherani, E. A. ; SOUSASANTOS, J. . Role of Bottom-Side Density Gradient in the Development of Equatorial Plasma Bubble/Spread F Irregularities: Solar Minimum and Maximum Conditions. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , v. 125, p. e2020JA027773, 2020.

• SOUSASANTOS, J. ; Kherani, E. A. ; Sobral, J. H. A. ; Abdu, M. A. ; MORAES, A. O. ; OLIVEIRA, C. B. A. . A Numerical Study on the 3-D Approach of the Equatorial Plasma Bubble Seeded by the Prereversal Vertical Drift. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , v. 124, p. 4539-4555, 2019.

• Kherani, E. A. ; BHARUTHRAM, R. ; MAHARAJ, S. K. . Growth of plasma waves of scales longer than 10-km by gradient-drift instability in the E-region of equatorial ionosphere. PHYSICS OF PLASMAS , v. 25, p. 072902, 2018.

• SOUSASANTOS, J. ; Kherani, E. A. ; Sobral, J. H. A. . An alternative possibility to equatorial plasma bubble forecasting through mathematical modeling and Digisonde data. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , v. 122, p. 2079-2088, 2017.

• JONAH, O. F. ; Kherani, E. A. ; de Paula, E. R. . Investigations of conjugate MSTIDS over the Brazilian sector during daytime. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , v. 122, p. 1-12, 2017.

• BAGIYA, MALA S. ; Kherani, E. A. ; SUNIL, P. S. ; SUNIL, A. S. ; SUNDA, S. ; RAMESH, D. S. . Origin of the ahead of tsunami traveling ionospheric disturbances during Sumatra tsunami and offshore forecasting. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS , v. 122, p. 7742-7749, 2017.

• Kherani, E. A. ; BHARUTHRAM, R. ; SINGH, S. ; LAKHINA, G. S. ; DE MENESES, F. CARLOS . Unstable density distribution associated with equatorial plasma bubble. PHYSICS OF PLASMAS , v. 23, p. 042901, 2016.

• Abdu, M. A. ; DE SOUZA, J. R. ; Kherani, E. A. ; Batista, I. S. ; MACDOUGALL, J. W. ; Sobral, J. H. A. . Wave structure and polarization electric field development in the bottom-side F layer leading to post sunset equatorial spread-F. Journal of Geophysical Research: Space Physics , v. 1, p. n/a-n/a, 2015.

• KHERANI, E.A. ; PATRA, A.K. . Fringe field dynamics over equatorial and low-latitude ionosphere: a three-dimensional perspective. Journal of Geophysical Research: Space Physics , v. 1, p. n/a-n/a, 2015.

• PAULA, E. R. ; JONAH, O. F. ; MORAES, A. O. ; KHERANI, E. A. ; FEJER, B. G. ; ABDU, M. A. ; MUELLA, M. T. A. H. ; BATISTA, I. S. ; DUTRA, S. L. G. ; PAES, R. R. . Low-latitude scintillation weakening during sudden stratospheric warming events. Journal of Geophysical Research: Space Physics , v. 120, p. n/a-n/a, 2015.

• KHERANI, E.A. ; ROLLAND, L. ; Lognonné, P. ; SLADEN, A. ; KLAUSNER, V. ; DE PAULA, E.R. . Traveling ionospheric disturbances propagating ahead of the Tohoku-Oki tsunami: a case study. Geophysical Journal International (Print) , v. 204, p. 1148-1158, 2015.

• Abdu, M. A. ; Kherani, E. A. ; Batista, I. S. ; Reinisch, B. W. ; Sobral, J. H. A. . Equatorial spread F initiation and growth from satellite traces as revealed from conjugate point observations in Brazil. Journal of Geophysical Research: Space Physics , v. 119, p. n/a-n/a, 2014.

• JONAH, O. F. ; PAULA, E. R. ; KHERANI, E. A. ; DUTRA, S. L. G. ; PAES, R. R. . Atmospheric and ionospheric response to sudden stratospheric warming of January 2013. Journal of Geophysical Research: Space Physics , v. 119, p. 4973-4980, 2014.

• CUEVA, R. Y. C. ; de Paula, E. R. ; KHERANI, A. E. . Statistical analysis of radar observed F region irregularities from three longitudinal sectors. Annales Geophysicae , v. 31, p. 2137-2146, 2013.

• SOUSASANTOS, JONAS ; Kherani, E. A. ; Sobral, J. H. A. . A numerical simulation study of the collisional-interchange instability seeded by the pre-reversal vertical drift. Journal of Geophysical Research: Space Physics , v. 118, p. n/a-n/a, 2013.

• Abdu, M. A. ; Batista, I. S. ; Reinisch, B. W. ; Bertoni, F. ; Sobral, J. H. A. ; Kherani, E. A. . Equatorial ionosphere responses to two magnetic storms of moderate intensity from conjugate point observations in Brazil. Journal of Geophysical Research , v. 117, p. A05321, 2012.

• Kherani, E. A. ; Lognonné, P. ; Hébert, H. ; ROLLAND, L. ; Astafyeva, E. ; Occhipinti, G. ; Coïsson, P. ; WALWER, D. ; de Paula, E. R. . Modelling of the total electronic content and magnetic field anomalies generated by the 2011 Tohoku-Oki tsunami and associated acoustic-gravity waves. Geophysical Journal International (Print) , v. 191, p. no-no, 2012.

• Abdu, M. A. ; Batista, I. S. ; Reinisch, B. W. ; MACDOUGALL, J. W. ; Kherani, E. A. ; Sobral, J. H. A. . Equatorial range spread F echoes from coherent backscatter, and irregularity growth processes, from conjugate point digital ionograms. Radio Science , v. 47, p. RS6003, 2012.

• KHERANI, E. A. ; de Paula, E.R. ; R.Y.C. Cueva ; Camargo, L.A.P. . Observations of nighttime equatorial-upper-E-valley region irregular structures from São Luís radar and their occurrence statistics: A manifestation of vertical coupling between E and F regions. Journal of Atmospheric and Solar-Terrestrial Physics , v. 75-76, p. 64-70, 2012.

• de Paula, E.R. ; Alam Kherani, E. ; Cueva, R.Y.C. ; Camargo, L.A.P. ; Kherani, E. A. . Observations of pre-midnight 5-m irregularities in the equatorial F region over São Luís, Brazil: Solar-flux dependence and seasonal variations. Journal of Atmospheric and Solar-Terrestrial Physics , v. 73, p. 1544-1554, 2011.

• Makela, J. J. ; Lognonné, P. ; Hébert, H. ; Gehrels, T. ; ROLLAND, L. ; Allgeyer, S. ; Kherani, A. ; Occhipinti, G. ; Astafyeva, E. ; Coïsson, P. ; Loevenbruck, A. ; Clévédé, E. ; Kelley, M. C. ; Lamouroux, J. . Imaging and modeling the ionospheric airglow response over Hawaii to the tsunami generated by the Tohoku earthquake of 11 March 2011. Geophysical Research Letters , v. 38, p. L00G02, 2011.

• ROLLAND, LUCIE M. ; Lognonné, Philippe ; ASTAFYEVA, ELVIRA ; Kherani, E. Alam ; KOBAYASHI, NAOKI ; MANN, MICHÈLE ; MUNEKANE, HIROSHI . The resonant response of the ionosphere imaged after the 2011 off the Pacific coast of Tohoku Earthquake. Earth, Planets and Space , v. 63, p. 853-857, 2011.

• Muella, M. T. A. H. ; Kherani, E. A. ; de Paula, E. R. ; Cerruti, A. P. ; Kintner, P. M. ; Kantor, I. J. ; Mitchell, C. N. ; Batista, I. S. ; Abdu, M. A. . Scintillation-producing Fresnel-scale irregularities associated with the regions of steepest TEC gradients adjacent to the equatorial ionization anomaly. Journal of Geophysical Research , v. 115, p. A03301, 2010.

• Takahashi, H. ; Gobbi, D. ; Taylor, M. J. ; de Paula, E. ; Pautet, P.-D. ; Arruda, D. ; Vadas, S. ; Abdu, M. A. ; Batista, I. S. ; Wrasse, C. M. ; Sobral, J. H. A. ; Medeiros, A. F. ; Kherani, E. A. ; Paulino, I. ; Fritts, D. . Equatorial ionosphere bottom-type spread F observed by OI 630.0 nm airglow imaging. Geophysical Research Letters , v. 37, p. L03102, 2010.

• KHERANI, E. A. ; ABDU M. A. ; PAULA, E. R. ; D. Fritts ; SOBRAL J. H. A. . The impact of gravity waves rising from convection in the lower atmosphere on the generation and nonlinear evolution of equatorial bubble. Annales Geophysicae , v. 27, p. 1657-1668, 2009.

• ABDU M. A. ; KHERANI, E. A. ; BATISTA I. S. ; PAULA, E. R. ; D. Fritts ; SOBRAL J. H. A. . Gravity wave initiation of equatorial spread F/plasma bubble irregularities based on observational data from the SpreadFEx campaign. Annales Geophysicae , v. 27, p. 2607-2622, 2009.

• Abdu, M. A. ; KHERANI, E. A. ; Batista, I. S. ; Sobral, J. H. A. . Equatorial evening prereversal vertical drift and spread F suppression by disturbance penetration electric fields. Geophysical Research Letters , v. 36, p. L19103, 2009.

• Kherani, E. Alam ; Lognonné, Philippe ; Kamath, Nishant ; Garcia, R. ; Crespon, Francois . Response of the ionosphere to the seismic trigerred acoustic waves: electron density and electromagnetic fluctuations. Geophysical Journal International (Print) , v. 176, p. 1-13, 2009.

• OCCHIPINTI G. ; KHERANI, E. A. ; LOGNONNE P. . Geomagnetic dependence of ionospheric disturbances induced by tsunamigenic internal gravity waves. Geophysical Journal International , v. 173, p. 753-765, 2008.

• Abdu, M. A. ; de Paula, E. R. ; Batista, I. S. ; Reinisch, B. W. ; Matsuoka, M. T. ; Camargo, P. O. ; Veliz, O. ; Denardini, C. M. ; Sobral, J. H. A. ; Kherani, E. A. ; de Siqueira, P. M. . Abnormal evening vertical plasma drift and effects on ESF and EIA over Brazil-South Atlantic sector during the 30 October 2003 superstorm. Journal of Geophysical Research , v. 113, p. A07313, 2008.

• de Paula, E. R. ; KHERANI, E. A. ; Abdu, M. A. ; Abdu, M. ; Batista, I. S ; Sobral, J.H.A. ; KANTOR, I ; Takahashi, Hisao ; Resende, L.C.A. ; MUELLA, M ; Rodrigues, F. S ; KINTNER, P ; LEDVINA, B. M. ; MITCHEL, C. ; Groves, K. M. . Characteristics of the ionospheric F-region plasma instabilities over Brazilian longitudinal sector. Indian Journal of Radio and Space Physics (Print) , v. 36, p. 268-277, 2007.

• OCCHIPINTI G. ; LOGNONNE P. ; KHERANI, E. A. ; HERBERT H. . Three dimensional modelling of ionospheric signature induced by the 2004 Sumatra tsunami. Geophysical Research Letters , v. 33, p. L2010, 2006.

• BERTONI F. C. P. ; BATISTA I. S. ; ABDU M. A. ; REINISH B. W. ; KHERANI, E. A. . A comparision of ionospheric vertical drift velocities measured by Digisonde and Incoherent scatter radar at the magnetic equator. Journal of Atmospheric and Solar-Terrestrial Physics , v. 68, p. 669, 2006.

• PATRA, A. ; TIWARI, D. ; SRIPATHI S. ; RAO, P. ; SRIDHARAN R. ; DEVASIA C. V. ; VISWANTHAN, K. ; SUBBARAO, K. ; R.SEKAR, ; KHERANI, E. A. . Simultaneous radar observations of meter-scale F region irregularities at and off the magnetic equator over India. Journal of Geophysical Research , v. 110, p. A0230, 2005.

• KHERANI, E. A. ; MASCARENHAS M. ; PAULA, E. R. ; SOBRAL J. H. A. ; BERTONI F. C. P. . A three dimension simulation model for Collisonal Interchange Instability. Space Science Reviews , v. 121, p. 253-269, 2005.

• PAULA, E. R. ; IYER K. N. ; HYSELL D. L. ; RODRIGUES F. S. ; KHERANI, E. A. ; JARDIM A. C. ; RZENDE L. F. C. ; DUTRA S. G. ; TRIVEDI N. B. . Multi-technique investigations of storm-time ionospheric irregularities over the São Luís equatorial station in Brazil. Annals of Geophysics , v. 22, p. 3513-3522, 2004.

• KHERANI, E. A. ; PAULA, E. R. ; BERTONI F. C. P. . Effects of the fringe field of Rayleigh-Taylor instability in the equatorial E and valley regions. Journal of Geophysical Research , v. 109, p. A1231, 2004.

• KHERANI, E. A. ; R.SEKAR, . Effects of molecular ions on the evolution of GRT instability: Numerical simulation. J. Geophys. Res. , v. 107, p. 1139, 2002.

• R.SEKAR, ; KHERANI, E. A. . The method of characteristic for non-linear generalized Rayleigh-Taylor instability associated with equatorial spread F: An analytical approach. Phys. Plasmas , American Institute of Physics, v. 9, p. 2754, 2002.

• KHERANI, E. A. ; R.SEKAR, ; RAGHAVARAO, R. . Equatorial rising structure in night-time E region: a manifestation of electro dynamical coupling of spread F. Journal of Atmospheric and Solar-Terrestrial Physics , v. 64, p. 1505, 2002.

• R.SEKAR, ; KHERANI, E. A. ; P.B.RAO, ; PATRA, A. . Interaction of two wavelength modes in the nonlinear numerical simulation model of equatorial spread F. Journal of Geophysical Research , American Geophysical Union, v. 106, p. 24765-24776, 2001.

• R.SEKAR, ; KHERANI, E. A. ; PATRA, A. ; DEVASIA, ; VISWANTHAN, K. ; TIWARI, D. ; SUBBARAO, K. ; RAMACHANDRAN, N. . Preliminary results on the Equatorial Spread F irregularities by VHF and HF radars. Indian J. Radio and Space Phys. , Indian Academy of Science, v. 29, p. 262-271, 2000.

• R.SEKAR, ; KHERANI, E. A. . Effects of molecular ions on the Rayleigh-Taylor instability in the night-time equatorial ionosphere. Journal of Atmospheric and Solar-Terrestrial Physics , Elsevier, v. 61, p. 399-405, 1999.

• ABDU M. A. ; KHERANI, E. A. . Coupling Processes in the Equatorial Spread F / Plasma Bubble. In: springer. (Org.). Aeronomy of the Earth's Atmosphere and Ionosphere. 1ed.: M.A. Abdu, D. Pancheva and A. Bhattacharyya, 2011, v. , p. 219-238.

• KHERANI, E. A. ; ABDU M. A. ; D. Fritts ; de Paula, E. R. . The acoustic gravity wave induced disturbances in the equatorial Ionosphere. In: springer. (Org.). Aeronomy of the Earth's atmosphere and Ionosphere. 1ed.: M.A. Abdu, D. Pancheva and A. Bhattacharyya, 2011, v. , p. 141-162.

Projetos de pesquisa

• 2023 - Atual

  Detecção ionosférica e imageamento de terremotos e tsunamis em tempo quase real, Descrição: O Projeto IONO-DIET visa desenvolver, pela primeira vez, métodos baseados na ionosfera que detectarão terremotos e tsunamis em tempo quase real (NRT), e determinarão os parâmetros que deram origem ao terremoto e/ou alturas de onda do tsunami a partir da ionosfera em NRT. A determinação destes parâmetros será feita com base na detecção de distúrbios ionosféricos co-sísmicos e co-tsunâmicos por receptores GNSS. Pretende-se através do IONO-DIET contribuir para a melhoria dos sistemas de alerta existentes, fornecendo rapidamente a informação que falta sobre a fonte sísmica e a génese do tsunami de um sismo, ou as estimativas das alturas de onda de tsunamis que se propagam em mar aberto.A ideia de usar medições ionosféricas para alertas de tsunami não é nova. No entanto, apesar de vários resultados sismo-ionosféricos promissores apresentados recentemente, os sistemas existentes ainda não atingiram este objetivo. O IONO-DIET pretende ser o último passo antes que o sistema de avaliação de risco EQ/tsunami baseado em ionosfera se torne uma realidade.Nossa abordagem é baseada no desenvolvimento de relações empíricas entre parâmetros de terremotos e tsunamis e suas assinaturas ionosféricas. Para atingir plenamente este objetivo principal, é necessário abordar os seguintes objetivos específicos: 1) avançar na compreensão do acoplamento Terra sólida/oceano/atmosfera/ionosfera e responder às questões científicas fundamentais; 2) distinguir distúrbios causados por NH daqueles de outras origens. Para isso, trabalharemos e resolveremos o maior desafio das ciências ionosféricas modernas - a identificação e diferenciação da fonte de perturbações ionosféricas propagantes (TIDs); 3) desenvolver algumas novas metodologias que satisfaçam os requisitos da NRT por serem precisas e rápidas.Para a execução das Tarefas do Projeto, além do quadro permanente de pesquisadores em ambos os institutos, pretendemos contratar 1 Doutorando, 2 Pós-Doutorados e 1 Engenheiro. Os encargos de contratação e a carga de trabalho serão divididos igualmente entre a França e o Brasil. (AU). , Situação: Em andamento; Natureza: Pesquisa. , Integrantes: Esfhan Alam Kherani - Coordenador / E.R.de Paula - Integrante / virginia Klausner - Integrante / Alexandre Pimenta - Integrante / jonas rodrigues de souza - Integrante / Giuliano Sant'Anna Marotta - Integrante.

• 2012 - Atual

  Traveling ionospheric disturbances: Simulation and Observation, the importance of latitudinal coupling of gravity wave-Perkins-Es layer instabilities and forcing from pre-seismic events, Descrição: In the mid-latitude ionosphere, the night-time Meso-scale Traveling Ionospheric Disturbances (MSTIDs) are the common phenomenon occurring in the F region. While numerous observations are devoted to study these phenomenon the theoret- ical work has legged far behind experiments. Two proposed mechanism are the following: (1) the excitation of MSTIDs by the combined action of gravity wave (AGWs) of auroral origin and Perkins instability (PI), (2) the excitation of the MSTIDs by the combined action of Perkins instability and Es-layer instability (EsI). Recently, Kelley (2011) recommends an unified approach involving AGW, PI and EsI that may account for most of the observed characteristics of MSTIDs. In the current research proposal, I propose the development of AGW-PI-EsI model under which following new simulation models will be developed: (1) the AGWs propaga- tion model from the high-latitude to mid/low-latitude atmosphere; (2) the Perkins instability model in the mid/low-latitude ionosphere; (3) the Es-layer instability model. The proposed unified model does not exist in the ionospheric community at present and its development in the present research proposal may ensure to explain numerous observed phenomenon for the first time. While the proposal is mainly theoretical in nature, an observation campaign of MSTIDs using dense GPS net- work together with all-sky imager and digisonde in the Brazilian southern region is also proposed. After the Japan tsunami, the airglow measurements reported by Makela et al (2011) have shown for the first time that the ionospheric disturbances associ- ated with the pre-tsunami can be identified even in the presence of much stronger MSTIDs. The causative mechanism for these pre-seismic-traveling-ionosphereic dis- turbances (PSTIDs) is not known but observations by Lognonn ́ et al (2011) show e the strong evidence of slow-slip process beneath the Earth during their observation. At present, what is lacking. , Situação: Em andamento; Natureza: Pesquisa. , Alunos envolvidos: Mestrado acadêmico: (1) Doutorado: (1) . , Integrantes: Esfhan Alam Kherani - Coordenador / Eurico R.de Paula - Integrante / M. Mascarenhas - Integrante / Abdu, M. A. - Integrante / Sobral, J. H. A. - Integrante / Jonathan Makela - Integrante / Philippe Lognonné - Integrante / Jonas Santos - Integrante., Financiador(es): Fundação de Amparo à Pesquisa do Estado de São Paulo - Auxílio financeiro.

• 2011 - 2013

  The Tohoku-Oki earthquake from Earth to Oceans and Space: a critical case-study to improve earthquake and tsunami (TO_EOS), Descrição: We propose to analyze the unprecedented data, both terrestrial, oceanic and spatial, related to the Mw9.0, 2011 Tohoku-oki, Japan, earthquake to improve our ability to anticipate on future large earthquakes and tsunami. The project includes three parts each exploring a different approach of the problem: - imaging of the whole earthquake sequence from years before the earthquake to the post- seismic deformation to infer the parameters controlling the evolution of the seismic cycle, - perform a detailed analysis and modeling of the ionospheric signals related to the earthquake and tsunami, and investigate the feasibility to use this approach for early-warning purpose, - perform a critical analysis and modeling of the possible slow-slip events prior the Tohoku-oki earthquake suggested in the airglow and deep sea-bottom pressure data (Makela et al., in pres). Hence, the capacity of this project to make significant improvements on earthquake and tsunami anticipation not only relies on an in-depth analysis of the unique data of the Tohoku- oki earthquake and tsunami, but it also extends the spectrum of the analysis via original and multidisciplinary tasks combining land, sea and space data.. , Situação: Concluído; Natureza: Pesquisa. , Integrantes: Esfhan Alam Kherani - Integrante / Lucie Rolland - Integrante / Elvira Astfyeva - Integrante / Philippe Lognoné - Integrante / Anthony Sladen - Coordenador., Financiador(es): Agence Nationale de la Recherche - Auxílio financeiro.