Skip to Main content Skip to Navigation
Journal articles

Plasma clouds and snowplows: Bulk plasma escape from Mars observed by MAVEN

Abstract : We present initial Mars Atmosphere and Volatile EvolutioN (MAVEN) observations and preliminary interpretation of bulk plasma loss from Mars. MAVEN particle and field measurements show that planetary heavy ions derived from the Martian atmosphere can escape in the form of discrete coherent structures or "clouds." The ions in these clouds are unmagnetized or weakly magnetized, have velocities well above the escape speed, and lie directly downstream from magnetic field amplifications, suggesting a "snowplow" effect. This postulated escape process, similar to that successfully used to explain the dynamics of active gas releases in the solar wind and terrestrial magnetosheath, relies on momentum transfer from the shocked solar wind protons to the planetary heavy ions, with the electrons and magnetic field acting as intermediaries. Fluxes of planetary ions on the order of 107 cm-2 s-1 can escape by this process, and if it operates regularly, it could contribute 10-20% of the current ion escape from Mars.
Document type :
Journal articles
Complete list of metadata

https://hal-insu.archives-ouvertes.fr/insu-03675431
Contributor : Nathalie POTHIER Connect in order to contact the contributor
Submitted on : Monday, May 23, 2022 - 11:28:49 AM
Last modification on : Monday, July 4, 2022 - 9:16:54 AM

File

Geophysical Research Letters -...
Publisher files allowed on an open archive

Licence

Copyright

Identifiers

Collections

Citation

J. S. Halekas, D. A. Brain, S. Ruhunusiri, J. P. Mcfadden, D. L. Mitchell, et al.. Plasma clouds and snowplows: Bulk plasma escape from Mars observed by MAVEN. Geophysical Research Letters, 2016, 43, pp.1426-1434. ⟨10.1002/2016GL067752⟩. ⟨insu-03675431⟩

Share

Metrics

Record views

7

Files downloads

7