王慧,,
郑志超,
何杨帆,
张科灯,
孙璐媛,
高洁
武汉大学电子信息学院空间物理系, 武汉 430072
基金项目: 国家自然科学基金(41974182)和中央高校基本科研专项基金(2042021kf0208)资助
详细信息
作者简介: 仲云芳, 女, 1998年3月生, 武汉大学博士研究生, 主要从事电离层和磁层方面的研究.E-mail: yunfang.zhong@whu.edu.cn
通讯作者: 王慧, 女, 1977年生, 武汉大学电子信息学院教授, 博士生导师, 主要从事磁层-电离层-热层耦合方面的观测和模拟研究.E-mail: h.wang@whu.edu.cn
中图分类号: P352收稿日期:2020-12-01
修回日期:2021-09-06
上线日期:2021-11-10
Seasonal and local time variations of auroral electrojet: CHAMP observation
ZHONG YunFang,WANG Hui,,
ZHENG ZhiChao,
HE YangFan,
ZHANG KeDeng,
SUN LuYuan,
GAO Jie
Department of Space Physics, School of Electronic Information, Wuhan University, Wuhan 430072, China
More Information
Corresponding author: WANG Hui,E-mail:h.wang@whu.edu.cn
MSC: P352--> Received Date: 01 December 2020
Revised Date: 06 September 2021
Available Online: 10 November 2021
摘要
摘要:极光电激流是极区电流系的重要组成部分.本文利用CHAMP卫星10年的高精度标量磁场数据研究了极光电激流的地方时和季节变化特征，并对卫星与地面台站观测到的极光电激流进行了对比分析.结果表明，日侧极光电激流主要受太阳辐射的影响，而夜侧极光电激流主要受亚暴的影响.极光电激流具有明显的年、半年变化特征.夏季东向电激流和日侧西向电激流强于冬季，而夜间西向电激流冬季强于夏季.东向电激流和日侧的西向电激流在两至点增强，夜侧的西向电激流则在两分点增强.西向电激流与AL、SML指数有较好的相关性，东向电激流与SMU指数有较好的相关性，而与AU指数有一定差异，这与地磁台站的有效探测范围有关.
关键词: 极光电激流/
极光活动指数/
亚暴/
CHAMP卫星
Abstract:The auroral electrojet is an important element of the polar current system. Based on ten years of high resolution scalar magnetic field data from CHAMP satellite, we studied the local time and seasonal variations of auroral electrojet. Furthermore, the auroral electrojet measured by satellite was compared with the auroral electrojet indices derived from the ground stations. It is shown that the daytime current is mainly controlled by the solar illumination, while the nighttime current is affected by the substorm. The auroral electrojet shows an obvious annual and semiannual variation. The eastward electrojet and the dayside westward electrojet are more intense in summer than in winter, while the nightside westward electrojet is more intense in winter than in summer. The eastward electrojet and the daytime westward electrojet is more intense at solstices, whereas the nighttime westward electrojet is more intense at equinoxes. The westward electrojet shows a good correlation with AL and SML indices. The eastward electrojet correlates well with the SMU index, but shows difference with the AU index. The discrepancy can be attributed to the fact that the peak eastward electrojet is located outside the detection range of the ground stations.
Key words:Auroral electrojet/
Auroral electrojet indices/
Substorm/
CHAMP
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