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Title: 土星プラズマディスクにおけるダスト-プラズマ相互作用
Other Titles: Dust-plasma interaction through the magnetosphere-ionosphere coupling in the Saturn’s inner magnetosphere
Authors: 堺, 正太朗1 Browse this author
渡部, 重十2 Browse this author
諸岡, 倫子3 Browse this author
Holmberg, Madeleine4 Browse this author
Wahlund, Jan-Erik5 Browse this author
Authors(alt): Sakai, Syotaro1
Watanabe, Shigeto2
Morooka, Michiko W.3
Holmberg, Madeleine4
Wahlund, Jan-Erik5
Issue Date: 19-Mar-2012
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 75
Start Page: 133
End Page: 144
Abstract: We statistically investigated the ion bulk speeds in the equatorial region of the Saturn’s inner magnetosphere using the Langmuir Probe (LP) onboard the Cassini spacecraft. The LP observations showed that the ion speeds are about 60% of the ideal co-rotation speed at 5 RS and the ions have between co-rotation and Keplerian speed. Beyond 7 RS the ion speeds are spread to be a larger speed and become close to the ideal co-rotation speed. It is suggested that the sub-micron sized negatively charged E ring dust contributes to the plasma dynamics in the plasma disk. We also calculated the ion speeds using the three components MHD equations, which include the interaction with dusts to investigate the effect of the ion-dust coulomb collision and the massloadings, and the magnetosphere-ionosphere coupling. Our model shows that the ion speeds can be significantly reduced by the magnetospheric electric fields generated by the collisions between ions and dusts. It is also indicated that the coulomb and/or direct collisions between ions and dusts can be effective around Enceladus.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第75号

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