Skip to Main content Skip to Navigation
Journal articles

Structure, dynamics, and seasonal variability of the Mars-solar wind interaction: MAVEN Solar Wind Ion Analyzer in-flight performance and science results

Abstract : We report on the in-flight performance of the Solar Wind Ion Analyzer (SWIA) and observations of the Mars-solar wind interaction made during the Mars Atmosphere and Volatile EvolutioN (MAVEN) prime mission and a portion of its extended mission, covering 0.85 Martian years. We describe the data products returned by SWIA and discuss the proper handling of measurements made with different mechanical attenuator states and telemetry modes, and the effects of penetrating and scattered backgrounds, limited phase space coverage, and multi-ion populations on SWIA observations. SWIA directly measures solar wind protons and alpha particles upstream from Mars. SWIA also provides proxy measurements of solar wind and neutral densities based on products of charge exchange between the solar wind and the hydrogen corona. Together, upstream and proxy observations provide a complete record of the solar wind experienced by Mars, enabling organization of the structure, dynamics, and ion escape from the magnetosphere. We observe an interaction that varies with season and solar wind conditions. Solar wind dynamic pressure, Mach number, and extreme ultraviolet flux all affect the bow shock location. We confirm the occurrence of order-of-magnitude seasonal variations of the hydrogen corona. We find that solar wind Alfvén waves, which provide an additional energy input to Mars, vary over the mission. At most times, only weak mass loading occurs upstream from the bow shock. However, during periods with near-radial interplanetary magnetic fields, structures consistent with Short Large Amplitude Magnetic Structures and their wakes form upstream, dramatically reconfiguring the Martian bow shock and magnetosphere.
Keywords : Mars solar wind
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03677090
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Wednesday, June 22, 2022 - 4:54:20 PM
Last modification on : Monday, July 4, 2022 - 9:41:36 AM

File

JGR Space Physics - 2016 - Hal...
Publisher files allowed on an open archive

Licence

Copyright

Identifiers

Collections

Citation

J. S. Halekas, S. Ruhunusiri, Y. Harada, G. Collinson, D. L. Mitchell, et al.. Structure, dynamics, and seasonal variability of the Mars-solar wind interaction: MAVEN Solar Wind Ion Analyzer in-flight performance and science results. Journal of Geophysical Research: Space Physics, 2017, 122, pp.547-578. ⟨10.1002/2016JA023167⟩. ⟨insu-03677090⟩

Share

Metrics

Record views

22

Files downloads

0