An induced global magnetic field looping around the magnetotail of Venus
An induced global magnetic field looping around the magnetotail of Venus
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DOI：
10.1002/2015ja021904
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
L. Chai;Yong Wei;W. Wan;Tielong Zhang;Z. Rong;M. Fraenz;E. Dubinin;Hui Zhang;J. Zhong;X. Han;S. Barabash
中科院分区：
文献类型：
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作者：
L. Chai;Yong Wei;W. Wan;Tielong Zhang;Z. Rong;M. Fraenz;E. Dubinin;Hui Zhang;J. Zhong;X. Han;S. Barabash
金星充当太阳风与有大气层的非磁化行星体相互作用的原型。它没有固有的偶极子或地壳磁场；唯一的磁场被认为是由覆盖的行星际磁场（IMF）形成的。然而，在金星北极地区观测到的大尺度磁场偏向于东向，似乎对国际货币基金组织的方向没有反应。这里我们表明，除了覆盖磁场外，金星上还存在第二种类型的感应全球磁场，而向东的磁场只是其中的一部分。这个全球磁场在磁尾周围呈圆柱形壳状分布，从行星尾部向太阳呈逆时针方向分布，这表明有两股电流分别沿着环场的内外边界流出和流入行星。
Venus serves as the prototype of solar wind interaction with unmagnetized planetary bodies with atmospheres. It has no intrinsic dipole or crustal magnetic field; the only magnetic field is believed to be formed by the draped interplanetary magnetic field (IMF). However, the large‐scale magnetic field observed over the north polar region of Venus has a bias in the dawnward direction and seemingly unresponsive to the IMF's direction. Here we show that besides the draped field, there is a second type of induced global magnetic field at Venus and the dawnward field is only a part of it. This global field has a distribution in a cylindrical shell around the magnetotail and a counterclockwise direction looking from the planetary tail toward the Sun, which demonstrates that there are two currents flowing out and in of the planet along the inner and outer boundaries of the looping field, respectively.