极区上行离子对地磁活动和季节变化响应的统计分析
投稿时间: 2016-06-13  最后修改时间: 2016-06-13  点此下载全文
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作者单位E-mail
蒋勇 南京信息工程大学 jznuist@163.com 
彭建东 南京信息工程大学 数学与统计学院  
丁留贯 南京信息工程大学 物理与光电工程学院  
蓝如师 南京信息工程大学 数学与统计学院  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:本文利用DMSP F13卫星离子漂移速度测量数据和Wind卫星行星际磁场测量数据,对极区顶部电离层离子整体上行进行研究,主要考察平静期和磁暴期离子上行强度;以及不同行星际磁场方向和季节对离子上行的影响。研究发现,无论是南半球还是北半球,磁暴期的上行发生率都超过平静期;无论磁暴期还是平静期,南半球在北向行星际磁场时上行发生率高于南向行星际磁场、北半球在南向行星际磁场时上行发生率高于北向行星际磁场,且该结论在磁暴期比平静期更为明显;南半球平静期在北向行星际磁场和南向行星际磁场时冬季的上行发生率都远高于夏季,超过2倍、北半球平静期在北向行星际磁场和南向行星际磁场时夏季的上行发生率高于冬季。
中文关键词:极区电离层  离子上行  行星际磁场  季节
 
A Statistical Analysis about the Geomagnetic Activities and Seasonal Changes of the Upward Ions in Polar Ionosphere
Abstract:Based on a large dataset of ion drift velocity measurements boarding on DMSP F13 satellite and interplanetary magnetic field measurements boarding on Wind satellite, a study is made on the plasma bulk upward in the topside polar ionosphere, the emphasis is put on the quit-time and the storm-time changes in distribution of upward occurrence and the impact of different interplanetary magnetic field and seasons on the upward occurrence. The results show that the storm-time occurrence possibility of upward events is higher than that during quiet-time in southern hemisphere and the northern hemisphere; when in the southern hemisphere and north of interplanetary magnetic field, the possibility of upward events is high than that in the southern hemisphere and south of interplanetary magnetic field、when in the northern hemisphere and south of interplanetary magnetic field, the possibility of upward events is high than that in the northern hemisphere and north of interplanetary magnetic field, and the conclusions in the magnetic storm period is more obvious than the quiet period; the possibility of upward events in winter is twice as big as summer when at quiet-time of southern hemisphere and north of interplanetary magnetic field and at storm-time of southern hemisphere and south of interplanetary magnetic field, and the possibility of upward events in summer is more than winter when at quiet-time of northern hemisphere and north of interplanetary magnetic field and at quiet-time of northern hemisphere and south of interplanetary magnetic field.
keywords:polar ionosphere  ion upward  interplanetary magnetic field  season
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