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10 results on '"Connerney, Jack E. P."'

4. Responses of the Martian Magnetosphere to Changes in the Solar Wind Velocity and the IMF Orientation

Author

Romanelli, Norberto, Modolo, Ronan, Leblanc, François, Chaufray, Jean-Yves, Martinez, Antoine, Dibraccio, Gina A., Espley, Jared R., Brain, David, Connerney, Jack E. P., Halekas, Jasper S., Mcfadden, J. P., Jakosky, Bruce M., HELIOS - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), University of Michigan [Ann Arbor], University of Michigan System, NASA Goddard Space Flight Center (GSFC), Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], University of Iowa [Iowa City], Space Sciences Laboratory [Berkeley] (SSL), University of California [Berkeley], University of California-University of California, Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley] (UC Berkeley), and University of California (UC)-University of California (UC)

Subjects
Ionospheres, [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], Magnetospheres, Physics::Space Physics, Planets, Astrophysics::Earth and Planetary Astrophysics
Abstract

International audience; The Mars Atmosphere and Volatile EvolutioN (MAVEN) mission is currently probing the very complex and dynamic Martian environment. Despite that main structures resulting from the interaction between the solar wind (SW) and the induced magnetosphere of Mars can be characterized using a steady state picture, time-dependent physical processes play a fudamental role modifying the reponse of such obstacle. These processes are the consequence of temporal variabilities in the internal and/or external electromagnetic fields and plasma properties. In this work we study the effects that changes in the IMF orientation and SW speed and the rotation of the crustal magnetic fields (CF) have on the Martian magnetosphere by means of MAVEN magnetic field and plasma measurements and LATMOS Hybrid Simulations (LatHyS) runs. Firstly, we analyze magnetic field and plasma measurements provided by MAVEN on 23 December 2014 between 06:00 UT and 14:20 UT. During this time interval the spacecraft sampled the Martian magnetosphere twice, with highly similar trajectories. MAVEN measurements suggest that the external conditions remained approximately constant when the spacecraft was inside the magnetosphere for the first time. In contrast, MAVEN observed changes in the IMF orientation before visiting the magnetosphere for the second time. Making use of the LatHyS model, we perform a time-dependent simulation to investigate the global response of the Martian plasma environment to the CF rotation and the change of the background magnetic field orientation, taking into account MAVEN observations to set the external conditions. Simulation results are compared with the MAVEN Magnetometer and Solar Wind Ion Analyzer observations obtained in the Martian magnetosphere and show a good agreement. Based on this agreement, we determine associated recovery timescales of the Martian magnetosphere to such event. Secondly, we perform LatHyS runs to characterize the response of the Martian magnetosphere to changes in the SW speed. Particularly, we investigate associated effects on the SW deflection taking place inside the Martian magnetosheath. Finally, we perform estimations of the total planetary proton and oxygen escape fluxes at different times during these events.

Published
2018

5. Proton cyclotron waves occurrence rate upstream from Mars observed by MAVEN: associated variability of the Martian upper atmosphere

Author

Romanelli, Norberto, Mazelle, Christian, Chaufray, Jean-Yves, Meziane, Karim, Shan, Lican, Ruhunusiri, Suranga, Connerney, Jack E. P., Espley, Jared R., Eparvier, Francis, Thiemann, Edward M. B., Halekas, Jasper S., Mitchell, David L., Mcfadden, James P., Brain, David, Jakosky, Bruce M., Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), HELIOS - LATMOS, Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Physics Department [UNB], University of New Brunswick (UNB), Institute of Geology and Geophysics [Beijing] (IGG), Chinese Academy of Sciences [Beijing] (CAS), Department of Physics and Astronomy [Ames, Iowa], Iowa State University (ISU), NASA Goddard Space Flight Center (GSFC), Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], Space Sciences Laboratory [Berkeley] (SSL), University of California [Berkeley] (UC Berkeley), University of California (UC)-University of California (UC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), University of California [Berkeley], and University of California-University of California

Subjects
[SDU.ASTR.SR]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Solar and Stellar Astrophysics [astro-ph.SR], H exosphere, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Temporal variability, Mars, EUV flux, PCWs
Abstract

International audience; Measurements provided by the Magnetometer and the Extreme Ultraviolet Monitor (EUVM) onboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft together with atomic H exospheric densities derived from numerical simulations are studied for the time interval from October 2014 up to March 2016. We determine the proton cyclotron waves (PCWs) occurrence rate observed upstream from Mars at different times. We also study the relationship with temporal variabilities of the high altitude Martian hydrogen exosphere and the solar EUV flux reaching the Martian environment. We find that the abundance of PCWs is higher when Mars is close to perihelion, and decreases to lower and approximately constant values after the Martian Northern Spring Equinox. We also conclude that these variabilities cannot be associated with biases in MAVEN's spatial coverage or changes in the background magnetic field orientation. Higher H exospheric densities on the Martian day side are also found when Mars is closer to perihelion, as a result of changes in the thermospheric response to variability in the ultraviolet flux reaching Mars at different orbital distances. A consistent behavior is also observed in the analyzed daily irradiances measured by the MAVEN EUVM. The latter trends point towards an increase in the planetary proton densities upstream from the Martian bow shock near perihelion. These results then suggest a method to indirectly monitor the variability of the H exosphere up to very high altitudes during large time intervals (compared to direct measurements of neutral particles), based on the observed abundance of PCWs.

Published
2016
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7. Multifluid MHD study of the solar wind interaction with Mars' upper atmosphere during the 2015 March 8th ICME event

Author

Dong, Chuanfei, primary, Ma, Yingjuan, additional, Bougher, Stephen W., additional, Toth, Gabor, additional, Nagy, Andrew F., additional, Halekas, Jasper S., additional, Dong, Yaxue, additional, Curry, Shannon M., additional, Luhmann, Janet G., additional, Brain, David, additional, Connerney, Jack E. P., additional, Espley, Jared, additional, Mahaffy, Paul, additional, Benna, Mehdi, additional, McFadden, James P., additional, Mitchell, David L., additional, DiBraccio, Gina A., additional, Lillis, Robert J., additional, Jakosky, Bruce M., additional, and Grebowsky, Joseph M., additional

Published
2015
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9. Multifluid MHD study of the solar wind interaction with Mars' upper atmosphere during the 2015 March 8th ICME event.

Author

Chuanfei Dong, Yingjuan Ma, Bougher, Stephen W., Toth, Gabor, Nagy, Andrew F., Halekas, Jasper S., Yaxue Dong, Curry, Shannon M., Luhmann, Janet G., Brain, David, Connerney, Jack E. P., Espley, Jared, Mahaffy, Paul, Benna, Mehdi, McFadden, James P., Mitchell, David L., DiBraccio, Gina A., Lillis, Robert J., Jakosky, Bruce M., and Grebowsky, Joseph M.

Published
2015
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10. Atmospheric Structure of Jupiter's Vortices as retrieved by Juno/JIRAM Data.

Author

Sindoni, Giuseppe, Filacchione, Gianrico, Grassi, Davide, Adriani, Alberto, Mura, Alessandro, Moriconi, Maria Luisa, Dinelli, Bianca Maria, Tosi, Federico, Piccioni, Giuseppe, Migliorini, Alessandra, Altieri, Francesca, Sordini, Roberto, Bolton, Scott J., Connerney, Jack E. P., Atreya, Sushil K., Ingersoll, Andy, Levin, Steven M., Lunine, Jonathan, Orton, Glenn S., and Plainaki, Christina

Published
2018

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