| 电离层极风的EISCAT-VHF雷达观测 |
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| 引用本文： | 吴健 Blanc,M.电离层极风的EISCAT-VHF雷达观测[J].地球物理学报,1993,36(1):9-17. |
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| 作者姓名： | 吴健 Blanc M |
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| 作者单位： | 1. 中国电波传播研究所，河南省新乡市138信箱，新乡453003;
2. OMP, 14, Avenue Edouard Belin, 31400 Toulouse, FRANCE;
3. CESR, 9, Avenue Colonel-Roche, 31024 Toulouse, FRANCE |
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| 基金项目： | 国家教育委员会留学回国人员工作资助费资助 |
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| 摘 要： | 极风现象从理论上提出已20多年了,实验上一直没有充分地证实这种现象的存在,以及它的形成区域位于高纬顶部电离层中.我们利用欧洲非相干散射协会（EISCAT）的VHF雷达（在挪威Tromsφ）,对H+离子极风进行了首次实验研究,结果表明,实验期间观测到H+离子在顶部电离层中的运动速度始终向上,且随高度的增加而增大,从而证实在高纬顶部电离层中确实存在着一个永久向上的H+离子流,即H+离子极风,其速度在1000km 高度上达到1km/s,其通量在此高度上接近于饱和,达到1012ms（-1）,而温度小于0.26eV.在我们的探测高度上仍未发展成超声速极风.
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| 关 键 词： | 电离层 极风 离子流 非相干雷达 |
| 收稿时间： | 1992-03-27 |
THE IONOSPHERIC POLAR WIND OBSERVATIONS WITH EISCAT VHF RADAR |
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| Wu JIAN.THE IONOSPHERIC POLAR WIND OBSERVATIONS WITH EISCAT VHF RADAR[J].Chinese Journal of Geophysics,1993,36(1):9-17. |
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| Authors: | Wu JIAN |
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| Institution: | China Research Institute of Radioware Propagation, P. O. Box 138, Xinxiang 453003)MICHEL BLANC(OMP, 14 Avenue Edouard Belin, 31400 Toulouse, France)DENIS ALCAYDE(CESR, 9 Avenue Colonel-Roche, 31029 Toulouse, Prance |
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| Abstract: | The polar wind was suggested theoretically more than 20 years before. Sufficient evidence has not been given by observations, especially observations in the high-latitude ionosphere. In this paper, we report the results of the first H+ polar wind observations with EISCAT VHF radar. It is shown during the observations that the H+ ion velocity is always upwards in the topside ionosphere and increases with altitude in the observed range, which implys that there is a pe-rament H+ thermal escape in the topside ionosphere with a temperature less than 0.26 eV, say the polar wind. Its outflow velocity is about 1 km/s at 1000 km altitude, and the flux arrives at about 1012 m-2.s-1 approaching the satured flux. The flow is still in the subsonic regime in the observed altitude range. |
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| Keywords: | Ionosphere Polar wind Ion escape Incoheren radar |
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