Compressibility of Mercury's dayside magnetosphere

Compressibility of Mercury's dayside magnetosphere
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水星白天磁层的可压缩性

DOI:
10.1002/2015gl067063
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发表时间:
2015-12
影响因子:
5.2
通讯作者:
Han X. H.
Han X. H.
中科院分区:
地球科学1区
文献类型:
--
作者:
Zhong J.;Wan W. X.;Wei Y.;Slavin J. A.;Raines J. M.;Rong Z. J.;Chai L. H.;Han X. H.

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水星正经历着太阳风的显著变化,太阳风迫使水星沿着它的大偏心轨道运行。12水星年的数据从水星表面,空间ENERMANCE,地球化学和测距,我们表明,水星的距离,太阳有一个很大的影响,白天侧磁层的大小是远远大于时间的变化。近日点太阳风的平均离地距离比远日点太阳风离地距离近0.27水星半径。在近日点,太阳下磁层顶可以压缩到1.2 RM以下的时间约为2.5%。平均磁层顶距离和日心距离之间的关系表明,平均而言,侵蚀过程的影响似乎抵消了水星内部近日点感应的影响。然而,在远日点,太阳风压力较低,阿尔夫文马赫数较高,诱导的影响似乎占主导地位。
The Mercury is experiencing significant variations of solar wind forcing along its large eccentric orbit. With 12 Mercury years of data from Mercury Surface, Space ENvironment, GEochemistry, and Ranging, we demonstrate that Mercury's distance from the Sun has a great effect on the size of the dayside magnetosphere that is much larger than the temporal variations. The mean solar wind standoff distance was found to be about 0.27 Mercury radii (RM) closer to the Mercury at perihelion than at aphelion. At perihelion the subsolar magnetopause can be compressed below 1.2 RM of ~2.5% of the time. The relationship between the average magnetopause standoff distance and heliocentric distance suggests that on average the effects of the erosion process appears to counter balance those of induction in Mercury's interior at perihelion. However, at aphelion, where solar wind pressure is lower and Alfvénic Mach number is higher, the effects of induction appear dominant.
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