Influence of Magnetic Fields on Precipitating Solar Wind Hydrogen at Mars

被引：4

作者：

Henderson, Sarah ^{[1
]}

Halekas, Jasper ^{[1
]}

Girazian, Zach ^{[1
]}

Espley, Jared ^{[2
]}

Elrod, Meredith ^{[3
,4
]}

机构：

[1] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA

[2] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[3] NASA, Goddard Space Flight Ctr, Planetary Environments Lab, Greenbelt, MD USA

[4] Univ Maryland, CRESST II, College Pk, MD 20742 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2022年 / 49卷 / 12期

关键词：

penetrating protons; solar wind hydrogen; MAVEN; 1ST-ENA OBSERVATIONS; UPPER-ATMOSPHERE; CHARGE-EXCHANGE; ATOMS; VARIABILITY; PROTON; ENAS;

D O I：

10.1029/2022GL099114

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Solar wind protons can interact directly with the hydrogen corona of Mars through charge exchange, resulting in energetic neutral atoms (ENAs) able to penetrate deep into the upper atmosphere of Mars. ENAs can undergo multiple charge changing interactions, leading to an observable beam of penetrating protons in the upper atmosphere. We seek to characterize the behavior of these protons in the presence of magnetic fields using data collected by the Mars Atmosphere and Volatile EvolutioN spacecraft. We find that backscattered penetrating proton flux is enhanced in regions where the magnetic field strength is greater than 200 nT. We also find a strong correlation at CO2 column densities less than 5.5 x 10(14) cm(-2) between magnetic field strength and the observed backscattered and downward flux. We do not see significant changes in penetrating proton flux with magnetic field strengths on the order of 10 nT.

引用

页数：10

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