Response of Jupiter’s inner magnetosphere to the solar wind derived from extreme ultraviolet monitoring of the Io plasma torus
Response of Jupiter’s inner magnetosphere to the solar wind derived from extreme ultraviolet monitoring of the Io plasma torus
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通过木卫一等离子体环的极紫外监测得出木星内部磁层对太阳风的响应
DOI：
10.1002/2016gl071675
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
M.
中科院分区：
文献类型：
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作者：
Murakami;G.; Yoshioka;K.; Yamazaki;A.; Tsuchiya;F.; Kimura;T.; Tao;C.; Kita;H.; Kagitani;M.; Sakanoi;T.; Uemizu;K.; Kasaba;Y.; Yoshikawa;I.; Fujimoto;M.
由于木星的磁层巨大且自转占主导地位，太阳风对其内部的影响一直被认为可以忽略不计。同时，也报道了该地区的黎明-黄昏不对称特征。从黎明到黄昏的电场的存在是这种不对称性的主要解释之一；然而，产生如此强烈电场的物理过程仍然不清楚。在这里，我们展示了由Hisaki卫星在2013年12月至2014年3月期间对木星内磁层木卫一等离子体环面的极端紫外线辐射的长期和连续监测。我们发现，随着太阳风动压的快速增加，有5次黄昏/黎明亮度比增加到2.5以上。这种增强是在黄昏区域变亮而黎明区域变暗时实现的。观测结果表明，在压缩条件下，磁层内的黎明到黄昏电场增强。
Because Jupiter's magnetosphere is huge and is rotationally dominated, solar wind influence on its inner part has been thought to be negligible. Meanwhile, dawn‐dusk asymmetric features of this region have been reported. Presence of dawn‐to‐dusk electric field is one of the leading explanations of the asymmetry; however, the physical process of generating such an intense electric field still remains unclear. Here we present long and continuous monitoring of the extreme ultraviolet emissions from the Io plasma torus in Jupiter's inner magnetosphere made by the Hisaki satellite between December 2013 and March 2014. We found five occasions where the dusk/dawn brightness ratio was enhanced above 2.5 in response to rapid increase of the solar wind dynamic pressure. The enhancement is achieved as the dusk region brightens and the dawn region dims. The observation indicates that dawn‐to‐dusk electric field in the inner magnetosphere is enhanced under compressed conditions.