2 results on '"C. R. Nasr"'
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2. Global Aurora on Mars During the September 2017 Space Weather Event
- Author
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Justin Deighan, Arnaud Stiepen, Sonal Jain, Christina O. Lee, David Brain, Nicholas M. Schneider, Ali Rahmati, A. I. F. Stewart, Bruce M. Jakosky, William E. McClintock, M. S. Chaffin, Daniel Lo, C. R. Nasr, Davin Larson, Franck Lefèvre, John Clarke, Gregory M. Holsclaw, Robert Lillis, Franck Montmessin, J. S. Evans, Michael H. Stevens, Matteo Crismani, Jasper Halekas, Roger V. Yelle, Laboratory for Atmospheric and Space Physics [Boulder] (LASP), University of Colorado [Boulder], Space Sciences Laboratory [Berkeley] (SSL), University of California [Berkeley], University of California-University of California, Department of Physics and Astronomy [Iowa City], University of Iowa [Iowa City], Laboratoire de Physique Atmosphérique et Planétaire (LPAP), Université de Liège, Computational Physics, Inc., Naval Research Laboratory (NRL), Lunar and Planetary Laboratory [Tucson] (LPL), University of Arizona, Center for Space Physics [Boston] (CSP), Boston University [Boston] (BU), PLANETO - 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 California [Berkeley] (UC Berkeley), University of California (UC)-University of California (UC), and 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)
- Subjects
High energy particle ,[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] ,010504 meteorology & atmospheric sciences ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Flux ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Mars Exploration Program ,Atmosphere of Mars ,Space weather ,01 natural sciences ,Atmosphere ,Geophysics ,13. Climate action ,Planet ,Physics::Space Physics ,0103 physical sciences ,General Earth and Planetary Sciences ,Astrophysics::Earth and Planetary Astrophysics ,010303 astronomy & astrophysics ,Southern Hemisphere ,Astrophysics::Galaxy Astrophysics ,Geology ,0105 earth and related environmental sciences - Abstract
International audience; We report the detection of bright aurora spanning Mars’ nightside during the space weather event occurring in September 2017. The phenomenon was similar to diffuse aurora detected previously at Mars, but 25 times brighter and detectable over the entire visible nightside. The observations were made with the Imaging UltraViolet Spectrograph (IUVS), a remote sensing instrument on the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft orbiting Mars. Images show that the emission was brightest around the limb of the planet, with a fairly uniform faint glow against the disk itself. Spectra identified four molecular emissions associated with aurora, and limb scans show the emission originated from an altitude of ~60 km in the atmosphere. Both are consistent with very high energy particle precipitation. The auroral brightening peaked around 13 September, when the flux of solar energetic electrons and protons both peaked. During the declining phase of the event, faint but statistically significant auroral emissions briefly appeared against the disk of the planet in the form of narrow wisps and small patches. These features are approximately aligned with predicted open field lines in the region of strong crustal magnetic fields in Mars’ southern hemisphere.
- Published
- 2018
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