| Influence of tail-like magnetic field on O~+ ion distribution in the Martian magnetosphere |
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| 作者姓名： | 史建魁 刘振兴 |
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| 作者单位： | SHI Jiankui LIU Zhenxing T. L. Zhang & K. TorkarCenter for Space Sciences and Applied Research，Chinese Academy of Sciences，Beijing 100080，China;Space Research Institute，Austrian Academy of Sciences，Graz A-8010，Austria |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China ( Grant No. 49884002) . |
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| 摘 要： | Based on the comparison with the Earth, using the LB magnetic field model, the distribution of O+ ion originating from the ionosphere in the Martian magnetosphere is theoretically studied under different conditions of the tail-like magnetic field. The results show that the tail-like magnetic field has influence on the O+ ion flux in the Martian magnetotail: ( i ) the O+ ion flux in the Martian tail will increase if the tail-like magnetic field increases; when the tail-like magnetic field increases from 5 nT to 20 nT, the O+ ion flux increases 3 times in the region of 2.8 Rm in the Martian tail; and ( ii ) the O + ion flux decreases with increasing intrinsic moment; when the intrinsic moment increases about 5 times, the flux decreases to one fourth in the region of 2.8 Rm in the Martian tail. According to the data on the O+ ion flux and theoretical result in this paper, the deduced Martian intrinsic moment is about 2 × 1021 Gcm3. This is consistent with the most recent observation by the USA satellite MG
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Influence of tail-like magnetic field on O~+ ion distribution in the Martian magnetosphere |
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| SHI Jiankui,LIU Zhenxing,T.L.Zhang,K.Torkar.Influence of tail-like magnetic field on O~+ ion distribution in the Martian magnetosphere[J].Science in China(Technological Sciences),2001,44(4):421-426. |
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| Authors: | SHI Jiankui LIU Zhenxing TLZhang KTorkar |
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| Affiliation: | 1. Center for Space Sciences and Applied Research, Chinese Academy of Sciences, Beijing 100080, China
2. Space Research Institute, Austrian Academy of Sciences, Graz A-8010, Austria |
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| Abstract: | Based on the comparison with the Earth, using the LB magneticfield model, the distribution of O+ ion originating from the ionosphere in the Martian magnetosphere is theoretically studied under different conditions of the tail-like magnetic field. The results show that the tail-like magnetic field has influence on the O+ ion flux in the Martian magnetotail: (ⅰ) the O+ ion flux in the Martian tail will increase if the tail-like magnetic field increases; when the tail-like magnetic field increases from 5 nT to 20 nT, the O+ ion flux increases 3 times in the region of 2.8 Rm in the Martian tail; and (ⅱ) the O+ ion flux decreases with increasing intrinsic moment; when the intrinsic moment increases about 5 times, the flux decreases to one fourth in the region of 2.8 Rm in the Martian tail. According to the data on the O+ ion flux and theoretical result in this paper, the deduced Martian intrinsic moment is about 2×1021 Gcm3. This is consistent with the most recent observation by the USA satellite MGS. |
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| Keywords: | Mars tail-like magnetic field flux of O+ ion intrinsic moment |
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