Mars global MHD predictions of magnetic connectivity between the dayside ionosphere and the magnetospheric flanks

被引：39
作者：
Liemohn, Michael W. [1 ]
Ma, Yingjuan
Frahm, Rudy A.
Fang, Xiaohua
Kozyra, Janet U.
Nagy, Andrew F.
Winningham, J. David
Sharber, James R.
Barabash, Stas
Lundin, Rickard
机构：
[1] Univ Michigan, AOSS Dept, Ctr Planetary Sci, Ann Arbor, MI 48109 USA
[2] SW Res Inst, San Antonio, TX USA
[3] Swedish Inst Phys, Kiruna, Sweden
来源：
SPACE SCIENCE REVIEWS | 2006年 / 126卷 / 1-4期
基金：
美国国家航空航天局; 美国国家科学基金会;
关键词：
Mars; atmospheric photoelectrons; Mars Express; numerical modeling;
D O I：
10.1007/s11214-006-9116-8
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Atmospheric photoelectrons have been observed well above the ionosphere of Mars by the ASPERA-3 ELS instrument on Mars Express. To systematically interpret these observations, field lines from two global MHD simulations were analyzed for connectivity to the dayside ionosphere (allowing photoelectron escape). It is found that there is a hollow cylinder behind the planet from 1-2 R (M) away from the Mars-Sun line that has a high probability of containing magnetic field lines with connectivity to the dayside ionosphere. These results are in complete agreement with the ELS statistics. It is concluded that the high-altitude photoelectrons are the result of direct magnetic connectivity to the dayside at the moment of the measurement, and no extra trapping or bouncing mechanisms are needed to explain the data.
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收藏
页码：63 / 76
页数：14
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