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Martian Thermospheric Response to an X8.2 Solar Flare on 10 September 2017 as Seen by MAVEN/IUVS

Sonal Jain 1 Justin Deighan 1 N. Schneider 1 A. Stewart 1 J. Evans 1 E. Thiemann 1 M. Chaffin 1 M. Crismani 1 M. Stevens 2 M. Elrod 3 Arnaud Stiepen 4 W. Mcclintock 1 D. Lo 5 J. Clarke 6 F. Eparvier 1 Franck Lefèvre 7 Franck Montmessin 7 G. Holsclaw 1 P. Chamberlin 1 B. Jakosky 1
1 LASP - Laboratory for Atmospheric and Space Physics [Boulder]
2 NRL - Naval Research Laboratory
3 GSFC - NASA Goddard Space Flight Center
4 LPAP - Laboratoire de Physique Atmosphérique et Planétaire
5 LPL - Lunar and Planetary Laboratory [Tucson]
6 CSP - Center for Space Physics [Boston]
7 PLANETO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : We report the response of the Martian upper atmosphere to a strong X‐class flare on September 10, 2017 as observed by the Imaging Ultraviolet Spectrograph (IUVS) instrument aboard the Mars Atmosphere Volatile EvolutioN (MAVEN) mission. The solar flare peaked at 16:24 hrs UT and IUVS dayglow observations were taken about an hour after the flare peak. Retrieved temperatures from IUVS dayglow observations show a significant increase during the flare orbit, with a mean value of ∼270 K and a maximum value of ∼310 K. The retrieved temperatures during the flare orbit also show a strong latitudinal gradient, indicating that the flare induced heating is limited between low‐ and mid‐latitudes. During this event IUVS observed an ∼70% increase in the observed brightness of CO2+ Ultraviolet Doublet and CO Cameron band emission at 90 km, where high‐energy photons (< 10 nm) deposit most of their energy.
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INSU | SU-SCIENCES | SORBONNE-UNIVERSITE | UVSQ | LATMOS | CNRS | UPMC | SU-TI | GS-ENGINEERING | INSTITUT-SCIENCES-LUMIERE | GS-GEOSCIENCES

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Sonal Jain, Justin Deighan, N. Schneider, A. Stewart, J. Evans, et al.. Martian Thermospheric Response to an X8.2 Solar Flare on 10 September 2017 as Seen by MAVEN/IUVS. Geophysical Research Letters, American Geophysical Union, 2018, 45 (15), pp.7312-7319. ⟨10.1029/2018GL077731⟩. ⟨insu-01798721⟩

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