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

Abstract

Here, we examine 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.

Authors:

Lee, Yuni  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-0463-7650"

Fang, Xiaohua  ^[2];

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• Search DOE PAGES for ORCID "0000-0002-6584-2837"

Gacesa, Marko  ^[3];

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• Search DOE PAGES for ORCID "0000-0001-5145-051X"

Ma, Yingjuan  ^[4];

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• Search DOE PAGES for ORCID "0000-0003-2584-7091"

Tenishev, Valeriy ^[5]; Mahaffy, Paul  ^[6];

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• Search DOE PAGES for ORCID "0000-0003-1896-1726"

Dong, Chuanfei  ^[7];

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Combi, Michael  ^[5];

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• Search DOE PAGES for ORCID "0000-0002-9805-0078"

Bougher, Stephen  ^[5];

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• Search DOE PAGES for ORCID "0000-0002-4178-2729"

Jakosky, Bruce  ^[2]

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• Search DOE PAGES for ORCID "0000-0002-0758-9976"

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+ Show Author Affiliations

1. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). CRESST II
2. Univ. of Colorado, Boulder, CO (United States). Lab. for Atmospheric and Space Physics
3. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States). Space Science Division; Bay Area Environmental Research Institute (BAERI), Moffett Field, CA (United States)
4. Univ. of California, Los Angeles, CA (United States). Dept. of Earth, Planetary, and Space Sciences
5. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Climate and Space Sciences and Engineering
6. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
7. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences and Princeton Plasma Physics Lab.

Publication Date:

Mon Feb 24 00:00:00 EST 2020

Research Org.:

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Org.:

USDOE; National Aeronautics and Space Administration (NASA)

OSTI Identifier:

1645126

Grant/Contract Number:  

AC02-09CH11466; 17-MDAP17_2-0152

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Geophysical Research. Space Physics

Additional Journal Information:

Journal Volume: 125; Journal Issue: 4; Journal ID: ISSN 2169-9380

Publisher:

American Geophysical Union

Country of Publication:

United States

Language:

English

Subject:

79 ASTRONOMY AND ASTROPHYSICS