赵旭东^1,,
何宇飞^1,,,
陈俊^3,4,
张素琴¹,
李琪¹,
袁伊人^1,2
1. 中国地震局地球物理研究所, 北京 100081
2. 北京大学地球与空间科学学院地球物理学系, 北京 100871
3. 安徽蒙城地球物理国家野外科学观测研究站, 安徽亳州 233527
4. 安徽省蒙城地震台, 安徽亳州 233527

基金项目: 国家重点研发计划（2018YFC1503504），国家重大科学仪器设备开发专项项目（2014YQ100817），国家自然科学基金（41504129）资助


详细信息

作者简介: 赵旭东, 男, 1983年生, 副研究员, 博士, 从事地磁与空间电流方面研究.E-mail:zxd9801@163.com

通讯作者: 何宇飞, 男, 1981年生, 助理研究员, 硕士, 从事地磁数据与空间电离层数据分析研究.E-mail:heyufei_bj@163.com

中图分类号: P353

收稿日期:2018-04-28
修回日期:2018-06-19
上线日期:2019-09-05

The distribution of ring current and field-aligned current during storms based on ground observatory data

ZHAO XuDong^1,,
HE YuFei^1,,,
CHEN Jun^3,4,
ZHANG SuQin¹,
LI Qi¹,
YUAN YiRen^1,2
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. Department of Geophysics, School of Earth and Space Science, Peking University, Beijing 100871, China
3. Anhui Mengcheng National Geophysical Research Station Field of Scientific Observation, Anhui Bozhou 233527, China
4. Mengcheng Seismic Station, Anhui Bozhou 233527, China


More Information

Corresponding author: HE YuFei,E-mail:heyufei_bj@163.com

MSC: P353

--> Received Date: 28 April 2018
Revised Date: 19 June 2018
Available Online: 05 September 2019


摘要
摘要:磁暴的发生与环电流的变化密切相关.除了对称环电流外，部分环电流在磁暴的发展过程中也起到了重要的作用，同时部分环电流通过场向电流与极区电离层中的电流形成回路.本文应用INTERMAGNET地磁台网北半球中低纬区域地磁台站数据，对不同强度4个磁暴事件主相和恢复相期间部分环电流和场向电流的磁地方时分布进行了分析和讨论.对于每一个磁暴事件，在低纬地区（地磁纬度约0°—40°N）选用地磁经度上大致均匀的8个台站，通过坐标转换计算平行于磁偶极轴的地磁场水平分量H来分析磁暴期间环电流所引起的磁场扰动；在低纬地区8个台站的基础上增加中纬地区（地磁纬度约40°N—60°N）地磁经度上大致均匀的6个台站，计算地磁坐标系下地磁场东西分量Y来分析磁暴期间场向电流在中低纬地区引起的磁场扰动.结果表明，磁暴主相期间的部分环电流主要作用于磁地方时昏侧和夜侧扇区，并且主相和恢复相期间部分环电流引起的磁场变化随着磁暴级别的增大而增大；磁暴主相期间向下的场向电流多出现在夜侧至晨侧扇区，向上的场向电流多出现在昏侧至午后扇区，且中纬地区向下和向上场向电流的展布范围明显大于低纬地区；恢复相期间弱、中磁暴事件的场向电流呈现与部分环电流相同的减弱趋势，而强、大磁暴事件在恢复相末期场向电流引起的磁场变化明显不同于恢复相的其他时刻，这可能与高纬较强的亚暴活动有关.
关键词: 磁暴/
部分环电流/
环电流/
场向电流

Abstract:The development of storm relates closely to the variation of ring currents. Besides symmetric ring currents, the partial ring currents also make great contribution to the storm. At the meanwhile, the partial ring currents connect with the field-aligned currents into the ionosphere of the polar region. This paper uses the geomagnetic data of ground observatories at middle and low latitude area in the north hemisphere to analyze the magnetic local time distribution of partial currents and field-aligned currents during the main and recovery phases of four storm events. For each event, eight observatories which are evenly located in geomagnetic longitude at low latitude regions (0°-40°N in geomagnetic latitude) are selected to calculate the component H (parallel to the dipole axis) for analyzing the geomagnetic disturbance caused by ring currents. Besides the eight observatories at low latitude regions, six observatories evenly located in geomagnetic longitude at middle latitude regions (40°N-60°N in geomagnetic latitude) are selected to study the geomagnetic disturbance caused by field-aligned currents using the component Y in geomagnetic coordinates. During the main phase of storm, the partial ring currents mainly affect in the dusk and evening side in magnetic local time. The geomagnetic field variation caused by partial ring currents increase with the enhancement of the storm magnitude in the main and recovery phases. The downward field-aligned currents mainly locate in the evening to the dawn side and the upward currents mainly locate in the dusk to the afternoon side during the main phase. Also, the downward and the upward field-aligned currents distribute widely in middle latitude regions than that in low latitude regions. During the recovery phase, field-aligned currents have a weaken trend as the partial currents fading in the weak and middle storm events. While in the recovery phase end of the strong and large storm events, the geomagnetic variation from field-aligned currents is much different from other times. This maybe relates to the strong substorms in the high latitude areas.
Key words:Storm/
Partial ring current/
Ring current/
Field-aligned current



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