期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 21, 页码 10805-10811出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL075446
关键词
Mars; escape; solar wind; primordial; CME; ASPERA
资金
- Swedish National Space Board (SNSB)
- SNSB
An extremely strong Coronal Mass Ejection (CME) impacted Mars on 12 July 2011, while the Mars Express spacecraft was present inside the nightside ionosphere. Estimated solar wind density and speed during the event are 39 particles cm(-3) and 730 km/s, corresponding to nominal solar wind flux at Mars when the solar system was similar to 1.1 Ga old. Comparing with expected average atmospheric heavy ion fluxes under similar XUV conditions, the CME impact is found to have no significant effect on the escape rate 3.3 x 10(24) s(-1), with an upper limit at 10(25) s(-1) if the observed tail contraction is not taken into account. On the subsequent orbit, 7 h later after magnetosphere response, fluxes were only 2.4% of average. As such, even under primordial solar wind conditions we are unable to find support for a strong solar wind-driven ion escape, rather the main effect appears to be acceleration of the escaping ions by x10-x20 typical characteristic energy.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据