Effects of Global and Regional Dust Storms on the Martian Hot O Corona and Photochemical Loss

Yuni Lee, Xiaohua Fang, Marko Gacesa, Yingjuan Ma, Valeriy Tenishev, Paul Mahaffy, Chuanfei Dong, Michael Combi, Stephen Bougher, Bruce Jakosky

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

We examine here for the first time the effects of both global and regional dust storms on the formation of the Martian hot O corona and associated photochemical loss of O. Our study is conducted by utilizing our integrated model framework, which couples our Martian hot O corona model with a multifluid magnetohydrodynamic model for Mars for the dusty and clear atmospheric condition cases. We present our results with the most up-to-date cross sections for the O(3P)-CO2 collisions. The main effect of dust storms on the ionosphere is the upward shift of the ionosphere on the dayside, which results in an increase in production of hot O at all altitudes above the ionospheric peak. However, the dust-induced inflation of the neutral upper atmosphere results in an enhancement in collisional loss of hot O and thus effectively suppresses the hot O density, reducing the global photochemical loss rate by ~28% for the global dust storm scenario. The relative density structure of the hot O corona does not show any significant changes, while its magnitude decreases at all altitudes.

Original languageBritish English
Article numbere2019JA027115
JournalJournal of Geophysical Research: Space Physics
Volume125
Issue number4
DOIs
StatePublished - 1 Apr 2020

Keywords

  • dust storm
  • exosphere
  • hot O corona
  • Mars
  • Monte Carlo model
  • photochemical escape

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