Journal article
Influence of Extreme Ultraviolet Irradiance Variations on the Precipitating Ion Flux From MAVEN Observations
Geophysical research letters, Vol.46(13), pp.7761-7768
07/16/2019
DOI: 10.1029/2019GL083595
Abstract
We study the influence of the solar extreme ultraviolet (EUV) flux intensity on the precipitating ion fluxes as seen by the Solar Wind Ion Analyzer, an energy and angular ion spectrometer aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft. We defined three periods with significantly different EUV flux intensity (1.6 and 3.2 times the lowest EUV intensity) and compare the precipitating ion flux measured by MAVEN/Solar Wind Ion Analyzer during each period. At low energy [30–650] eV, we find that the median (average) precipitating ion flux during the medium and low EUV periods are, respectively, 1.7 (2.1) and 3 (3.5) times more intense than the flux during the high EUV period. At high energy [650–25,000] eV, a similar trend in the intensity of the precipitating ion flux is observed but with an increase by 50% (46%) and 70% (79%), respectively. A larger EUV flux does therefore not seem to favor heavy ion precipitation into Mars's atmosphere, contrary to modeling prediction and overall expectations.
Details
- Title: Subtitle
- Influence of Extreme Ultraviolet Irradiance Variations on the Precipitating Ion Flux From MAVEN Observations
- Creators
- Antoine Martinez - Laboratoire atmosphères, milieux, observations spatialesFrançois Leblanc - Laboratoire atmosphères, milieux, observations spatialesJean-Yves Chaufray - Laboratoire atmosphères, milieux, observations spatialesRonan Modolo - University of Paris-SaclayOlivier Witasse - European Space Research and Technology CentreY. Dong - Laboratory for Atmospheric and Space PhysicsT. Hara - University of California, BerkeleyJ. Halekas - University of IowaR. Lillis - University of California, BerkeleyJ. Mcfadden - University of California, BerkeleyF. Eparvier - University of IowaLudivine Leclercq - University of VirginiaJ. Luhmann - University of California, BerkeleyS. Curry - University of California, BerkeleyD. Titov - European Space Research and Technology CentreB. Jakosky - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.46(13), pp.7761-7768
- Publisher
- American Geophysical Union
- DOI
- 10.1029/2019GL083595
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Language
- English
- Date published
- 07/16/2019
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428673302771
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