Characteristics of solar wind control on Jovian UV auroral activity deciphered by long-term Hisaki EXCEED observations: Evidence of preconditioning of the magnetosphere?
Characteristics of solar wind control on Jovian UV auroral activity deciphered by long-term Hisaki EXCEED observations: Evidence of preconditioning of the magnetosphere?
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DOI：
10.1002/2016gl069481
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发表时间：
2016-07-16
影响因子：
5.2
通讯作者：
Fujimoto, Masaki
中科院分区：
文献类型：
--
作者：
Kita, Hajime;Kimura, Tomoki;Fujimoto, Masaki
虽然众所周知，木星磁层有其活动的内部来源，但据报道，它也受到太阳风的影响。本文报道了木星紫外线极光的总功率与Hisaki卫星上的极紫外层动力学光谱仪EXCESS长期监测到的太阳风性质之间的统计关系。叠加历元分析表明，当增强的太阳风动力压撞击磁层时，极光总功率增加。此外，极光总功率与太阳风在动压上升之前的静止间隔的持续时间呈正相关，而不是与动压增加的幅度成正相关。这些统计特征定义了下一步揭示太阳风控制木星磁层动力学的物理机制的步骤。
While the Jovian magnetosphere is known to have the internal source for its activity, it is reported to be under the influence of the solar wind as well. Here we report the statistical relationship between the total power of the Jovian ultraviolet aurora and the solar wind properties found from long-term monitoring by the spectrometer EXCEED (Extreme Ultraviolet Spectroscope for Exospheric Dynamics) on board the Hisaki satellite. Superposed epoch analysis indicates that auroral total power increases when an enhanced solar wind dynamic pressure hits the magnetosphere. Furthermore, the auroral total power shows a positive correlation with the duration of a quiescent interval of the solar wind that is present before a rise in the dynamic pressure, more than with the amplitude of dynamic pressure increase. These statistical characteristics define the next step to unveil the physical mechanism of the solar wind control on the Jovian magnetospheric dynamics.