Field-Aligned Currents Induced by Magnetopause Motions Under Pressure Perturbations

被引：0

作者：

Wang, Boyi ^{[1
,2
]}

Xu, Xinyu ^{[1
]}

Nishimura, Yukitoshi ^{[3
,4
]}

Wu, Yen-Jung ^{[5
]}

Xu, Zhonghua ^{[6
]}

Kajdic, Primoz ^{[7
]}

Han, De-Sheng ^{[8
]}

Wang, Yi ^{[1
,2
]}

Feng, Xueshang ^{[1
,2
]}

机构：

[1] Harbin Inst Technol Shenzhen, Sch Aerosp Sci, Shenzhen, Peoples R China

[2] Harbin Inst Technol Shenzhen, Shenzhen Key Lab Numer Predict Space Storm, Shenzhen, Peoples R China

[3] Boston Univ, Dept Elect & Comp Engn, Boston, MA USA

[4] Boston Univ, Ctr Space Phys, Boston, MA USA

[5] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA USA

[6] Virginia Tech, Ctr Space Sci & Engn Res, Blacksburg, VA USA

[7] Univ Nacl Autonoma Mexico, Dept Ciencias Espaciales, Inst Geofis, Mexico City, Mexico

[8] Tongji Univ, Sch Ocean & Earth Sci, State Key Lab Marine Geol, Shanghai, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2025年 / 52卷 / 01期

基金：

美国国家科学基金会;

关键词：

magnetopause; foreshock; aurora; field-aligned currents; TRAVELING CONVECTION VORTICES; MOVING AURORAL FORMS; HOT FLOW ANOMALIES; SOLAR-WIND; FORESHOCK; SIGNATURES; MAGNETOSPHERE; EVENTS;

D O I：

10.1029/2024GL111958

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

In this work, we identified 65 auroral arcs that stretched out from the equatorward boundary of auroral oval with azimuthal extensions, and investigated their upstream triggering, by utilizing conjunctions between the THEMIS probes and the all-sky imagers at AGO P1 and South Pole stations. The results show that the magnetopause motions induced by pressure enhancements associated with IMF discontinuities or foreshock cavities likely generate upward FACs in the closed field lines near the magnetopause. The inward and azimuthal motions of magnetopause caused equatorward-moving auroral arcs, which extended westward or eastward, centered in the prenoon (12-13 MLT) or postnoon (9-10 MLT) sectors, respectively. The dawn-dusk asymmetry in this distribution may be due to the contribution from foreshock activities. Furthermore, stronger compression can push the magnetopause further inward, causing FACs and the corresponding discrete auroras to be distributed over a wider region extending further in both latitude and local time.

引用

页数：11

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