Asymmetries in Mars' exosphere

被引：13

作者：

Holmstrom, Mats ^{[1
]}

机构：

[1] Swedish Inst Space Phys, SE-98128 Kiruna, Sweden

来源：

SPACE SCIENCE REVIEWS | 2006年 / 126卷 / 1-4期

关键词：

Mars; energetic neutral atoms; X-rays; exospheres; SOLAR-WIND; UPPER-ATMOSPHERE; HYDROGEN; OXYGEN;

D O I：

10.1007/s11214-006-9036-7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Observations and simulations show that Mars' atmosphere has large seasonal variations. Total atmospheric density can have an order of magnitude latitudinal variation at exobase heights. By numerical simulations we show that these latitude variations in exobase parameters induce asymmetries in the hydrogen exosphere that propagate to large distances from the planet. We show that these asymmetries in the exosphere produce asymmetries in the fluxes of energetic neutral atoms (ENAs) and soft X-rays produced by charge exchange between the solar wind and exospheric hydrogen. This could be an explanation for asymmetries that have been observed in ENA and X-ray fluxes at Mars.

引用

页码：435 / 445

页数：11

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