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| 利用COSMIC数据研究顶部电离层O~+扩散流的统计特征 | |
| 引用本文： | 陈光明,徐寄遥,WANG Wenbin,LEI Jiuhou,DENG Yue.利用COSMIC数据研究顶部电离层O~+扩散流的统计特征[J].空间科学学报,2010,30(2). |
| 作者姓名： | 陈光明 徐寄遥 WANG Wenbin LEI Jiuhou DENG Yue |
| 作者单位： | 1. 中国科学院空间科学与应用研究中心,空间天气学国家重点实验室,北京,100190;中国科学院研究生院 2. 中国科学院空间科学与应用研究中心,空间天气学国家重点实验室,北京,100190 3. High Altitude Observatory, National Center for Atmospheric Research, Boulder, USA 4. Department of Aerospace Engineering Sciences, University of Colorado, Boulder, USA 5. University of Colorado and NOAA Space Weather Prediction Center, Boulder, USA |
| 基金项目： | 国家自然科学基金项目(40828003,40621003);;国家重点基础研究规划项目(2006CB806306)共同资助 |
| 摘 要： | 从等离子体运动方程出发,利用COSMIC星座的掩星数据,借助相关经验模式,计算了太阳活动低年顶部电离层O~+场向扩散速度和扩散通量,并分析了其全球分布和日变化特征.结果表明,白天等离子体扩散速度的方向随高度增加由向下(极向)逐步变为向上(赤道向),方向转变的高度一般在h_mF_2+80 km以下.在白天较高高度,南北磁纬10°～20°存在着向上方向的最大扩散速度和扩散通量;而在夜间,南北磁纬30°～40°存在向下方向的最大扩散速度和扩散通量.在分点,南北半球的扩散通量和扩散速度大致对称;而在至点,扩散通量存在着明显的南北半球不对称现象.另外,不同纬度的扩散速度有着不同的日变化特征. |
| 关 键 词： | 顶部电离层 扩散速度 扩散通量 掩星 |
Plasma Diffusive Flows in the Topside Ionosphere From Radio Occultation Measurements by COSMIC |
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| CHEN Guangming,XU Jiyao,WANG Wenbin,LEI Jiuhou,DENG Yue.Plasma Diffusive Flows in the Topside Ionosphere From Radio Occultation Measurements by COSMIC[J].Chinese Journal of Space Science,2010,30(2). | |
| Authors: | CHEN Guangming XU Jiyao WANG Wenbin LEI Jiuhou DENG Yue |
| Affiliation: | 1/a>;2;State Key Laboratory of Space Weather/a>;Center for Space Science and Applied Research/a>;Chinese Academy of Sciences/a>;Beijing 100190;Graduate University of Chinese Academy of Sciences;High Altitude Observatory/a>;National Center for Atmospheric Research/a>;Boulder/a>;USA;Department of Aerospace Engineering Sciences/a>;University of Colorado/a>;USA;University of Colorado and NOAA Space Weather Prediction Center/a>;USA |
| Abstract: | O~+ field-aligned diffusive velocities and fluxes in the topside ionosphere have been calculated from electron density profiles retrieved from COSMIC radio occultation measurements.The diffusive velocities and fluxes from October 2006 to October 2007 at low-latitude and mid-latitude have been statistically analyzed.The results show that daytime diffusive fluxes changed gradually from downward to upward as altitude increased.The translation height is below h_mF_2 + 80 km.The largest values of the upward diff... |
| Keywords: | Topside ionosphere Diffusive velocity Diffusive flux Radio occultation |
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