| 不同地磁活动水平下电离层H+上行的半球对比研究 |
| |
| 引用本文： | 赵凯,蒋勇,门可佩,黄林峰,傅帅.不同地磁活动水平下电离层H+上行的半球对比研究[J].地球物理学报,2014,57(11):3715-3728. |
| |
| 作者姓名： | 赵凯 蒋勇 门可佩 黄林峰 傅帅 |
| |
| 作者单位： | 1. 南京信息工程大学数学与统计学院-空间天气研究所, 南京 210044;2. 南京信息工程大学数学与统计学院, 南京 210044;3. 中国气象局国家卫星气象中心, 北京 100081 |
| |
| 基金项目： | 国家自然科学基金(41174165), 江苏省研究生创新计划项目(CXLX13-501)资助. |
| |
| 摘 要： | 使用FAST/TEAMS仪器在第23太阳活动周下降相的数据,从地磁活动水平的角度,分别分析在磁静日(Kp≤2+)和磁扰日(Kp≥3+)时南(SH)、北半球(NH)高纬(>50°)电离层H+的上行强度,计算其上行率和净上行积分能通量,以期得到H+上行的长期水平并分析地磁扰动期间南、北半球离子上行强度的异同.研究结果表明,磁扰期间上行强度显著加强,平静期南、北半球的平均上行率分别是~15%和~20%,而磁扰期的平均上行率分别增强了1.45倍和1.04倍,磁扰期间南半球上行强度的增长更显著;平静期南半球的上行强度小于北半球,但磁扰期两个半球的上行强度相当;磁午夜和黎明区间受地磁扰动的影响最显著,其磁扰期与平静期上行率的比值(S/Q)最大,同时南半球在各个地方时区间的S/Q值均大于北半球;另外,我们发现磁扰期间的上行率在极光椭圆带下边界附近增幅最明显,而积分通量在上边界附近增加显著.上行源区以平静期的源区为中心从日侧极尖区扩展到磁午夜、且向低磁纬延伸,同时,极尖区上行源区在磁扰期有向晨侧偏移的趋势.
|
| 关 键 词： | 磁层-电离层耦合 上行H+ 地磁扰动 半球对比研究 |
| 收稿时间： | 2014-09-16 |
Interhemispheric comparisons of ionospheric upflow H+ at various geomagnetic activity levels using FAST observations |
| |
| ZHAO Kai,JIANG Yong,MEN Ke-Pei,HUANG Lin-Feng,FU Shuai.Interhemispheric comparisons of ionospheric upflow H+ at various geomagnetic activity levels using FAST observations[J].Chinese Journal of Geophysics,2014,57(11):3715-3728. |
| |
| Authors: | ZHAO Kai JIANG Yong MEN Ke-Pei HUANG Lin-Feng FU Shuai |
| |
| Institution: | 1. Institute of Space Science, Nanjing University of Information Science & Technology, Nanjing 210044, China;2. School of Mathematics and Statistics, Nanjing University of Information Science & Technology, Nanjing 210044, China;3. National Satellite Meteorological Center, China Meteorological Administrator, Beijing 100081, China |
| |
| Abstract: | Using the FAST/TEAMS observations on the declining phase of solar cycle 23 (SC23), we individually calculated the H+ upflow rates during geomagnetic quiet times (Kp≤2+) and disturbed times (Kp≥3+) over the southern (SH) and northern (NH) high-latitude polar regions, respectively. We investigate into the long-term magnitude of upflow intensity and correlations between the hemispheres. It is found that the total intensity is significantly enhanced during geomagnetic disturbed times by a factor of 1.04 and 1.45 for the northern and southern hemispheres, respectively. The enhancement in southern hemisphere is more dramatic than that in northern hemisphere, the hemispherically averaged intensities all arrive at ~22% during disturbed times while the quiet time upflow rate is ~15% and ~20%, respectively. The midnight and dawnside upflows are more sensitive to geomagnetic disturbance. The upflow rates increase remarkably at low boundary of aurora oval, and during disturbed times, the high occurrence upflow region spreads from the dayside cusp region towards the midnight auroral zone and towards lower invariant latitudes. In addition, the polar cusp region moves gradually to the dawnside during disturbed times. |
| |
| Keywords: | M-I coupling Ionospheric H+upflow Geomagnetic disturbance Interhemispheric comparisons |
|
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
