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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第75号 >
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
| 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) |
| URI: | http://hdl.handle.net/2115/49076 |
| 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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