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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- 作者：Hajime Kita ; Tomoki Kimura ; Chihiro Tao ; Fuminori Tsuchiya ; Hiroaki Misawa ; Takeshi Sakanoi ; Yasumasa Kasaba ; Go Murakami ; Kazuo Yoshioka ; Atsushi Yamazaki ; et al
- 刊名：Geophysical Research Letters
- 出版年：2016
- 出版时间：16 July 2016
- 年：2016
- 卷：43
- 期：13
- 页码：6790-6798
- 全文大小：663.6KB
- ISSN：1944-8007
文摘
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.