Weakening of Jupiter's main auroral emission during January 2014
Weakening of Jupiter's main auroral emission during January 2014
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DOI：
10.1002/2015gl067366
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发表时间：
2016-02
影响因子：
5.2
通讯作者：
S. Badman;B. Bonfond;M. Fujimoto;R. Gray;Y. Kasaba;S. Kasahara;T. Kimura;H. Melin;J. Nichols;A. Steffl;Chengcheng Tao;F. Tsuchiya;A. Yamazaki;M. Yoneda;I. Yoshikawa;K. Yoshioka
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文献类型：
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作者：
S. Badman;B. Bonfond;M. Fujimoto;R. Gray;Y. Kasaba;S. Kasahara;T. Kimura;H. Melin;J. Nichols;A. Steffl;Chengcheng Tao;F. Tsuchiya;A. Yamazaki;M. Yoneda;I. Yoshikawa;K. Yoshioka
2014年1月，木星的FUV主极光椭圆减少了70%的发射功率，并向赤道方向移动了约1°。强烈的低纬度特征也被检测到。发射功率的减少是由于极光电流密度的减少而不是电子能量的减少。这可能是由于源电子密度的降低，源电子热能的一个数量级的增加，或这些因素的组合造成的。两者都可以用磁层的膨胀或热等离子体通过中间磁层向内输运的增加及其与向外移动的冷通量管的交换来解释。在后一种情况下，热等离子体可能提高了源区域的电子温度，并产生了强烈的低纬度特征，而冷等离子体输运速率的增加则产生了主椭圆的移动。
In January 2014 Jupiter's FUV main auroral oval decreased its emitted power by 70% and shifted equatorward by ∼1°. Intense, low‐latitude features were also detected. The decrease in emitted power is attributed to a decrease in auroral current density rather than electron energy. This could be caused by a decrease in the source electron density, an order of magnitude increase in the source electron thermal energy, or a combination of these. Both can be explained either by expansion of the magnetosphere or by an increase in the inward transport of hot plasma through the middle magnetosphere and its interchange with cold flux tubes moving outward. In the latter case the hot plasma could have increased the electron temperature in the source region and produced the intense, low‐latitude features, while the increased cold plasma transport rate produced the shift of the main oval.