Martian Meteoric Mg+: Atmospheric Distribution and Variability From MAVEN/IUVS

Author:

Crismani M. M. J.1ORCID,Tyo R. M.1,Schneider N. M.2ORCID,Plane J. M. C.3ORCID,Feng W.34ORCID,Carrillo‐Sánchez J. D.56ORCID,Villanueva G. L.5ORCID,Jain S.2ORCID,Deighan J.2ORCID,Curry S.7ORCID

Affiliation:

1. Department of Physics California State University San Bernardino CA USA

2. Laboratory for Atmospheric and Space Physics Boulder CO USA

3. School of Chemistry University of Leeds Leeds UK

4. National Centre for Atmospheric Science University of Leeds Leeds UK

5. NASA Goddard Space Flight Center Greenbelt MD USA

6. Department of Physics Catholic University of America Washington DC USA

7. Space Sciences Laboratory Berkeley CA USA

Abstract

AbstractSince the discovery of atmospheric Mg+ on Mars in 2015 by the Mars Atmosphere and Volatile Evolution mission, there have been almost continuous observations of this meteoric ion layer in a variety of seasons, local times, and latitudes. Here, we present the most comprehensive set of observations of the persistent metal ion layer at Mars, constructing the first grand composite maps from pooled medians of subsamples of a metallic ion species. These maps demonstrate that Mg+ appears in almost all conditions when illuminated, with peak density values varying between 100 and 500 cm−3, dependent on season and local time. There exists significant latitudinal variation within a given season, indicating that Mg+ is not simply an inert tracer, but may instead be influenced by the meteoric input distribution and/or atmospheric dynamics and chemistry. Geographic maps of Mg+ density as a function of latitude and longitude indicate the influence of atmospheric tides, and there is no apparent correlation with remnant crustal magnetic fields. This work also presents counter‐intuitive results, such as a reduction of Mg+ ions in the northern hemisphere during Northern Winter in an apparent correlation with dust aerosols.

Funder

Goddard Space Flight Center

European Research Council

Science and Technology Facilities Council

Publisher

American Geophysical Union (AGU)

Subject

Space and Planetary Science,Earth and Planetary Sciences (miscellaneous),Geochemistry and Petrology,Geophysics

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