Quasi-planar ICME sheath: A cause of the first two-step extreme geomagnetic storm of the 25th solar cycle observed on 23 April 2023

被引：6

作者：

Ghag, Kalpesh ^{[1
]}

Raghav, Anil ^{[1
]}

Bhaskar, Ankush ^{[2
]}

Soni, Shirsh Lata ^{[3
]}

Sathe, Bhagyashri ^{[1
]}

Shaikh, Zubair ^{[4
]}

Dhamane, Omkar ^{[1
]}

Tari, Prathmesh ^{[1
]}

机构：

[1] Univ Mumbai, Dept Phys, Mumbai 400098, India

[2] ISRO, Vikram Sarabhai Space Ctr, Space Phys Lab, Thiruvananthapuram 695022, Kerala, India

[3] Univ Michigan, 500 S State St, Ann Arbor, MI 48109 USA

[4] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

来源：

ADVANCES IN SPACE RESEARCH | 2024年 / 73卷 / 12期

关键词：

RING CURRENT; MAGNETIC-FIELD; ALFVEN-WAVE; WIND; ORIGIN; REGION; SHOCK; STREAMS; CLOUDS; PHASE;

D O I：

10.1016/j.asr.2024.03.011

中图分类号：

V [航空、航天];

学科分类号：

08 ; 0825 ;

摘要：

Interplanetary Coronal Mass Ejections (ICMEs) are prominent drivers of space weather disturbances. The reported studies suggested that the planar ICME sheath and planar magnetic clouds (MCs) cause extreme geomagnetic storms. Here, we investigated the first two-step extreme geomagnetic storm (Sym- H similar to -231 nT) of 25th solar cycle. Our analysis demonstrates the transformation of ICME sheath into quasi-planar magnetic structures (PMS). The study corroborates our earlier reported finding that the less adiabatic expansion in possible quasi-PMS transformed ICME enhanced the strength of the southward magnetic field component. It contributes to the efficient transfer of plasma and energy in the Earth's magnetosphere to cause the observed extreme storm. We found that the magnetosphere stand-off distance reduced to < 6R(E) (where R-E stands for the Earth's radius), and it impacts geosynchronous satellites moving close to 6R(E). (c) 2024 COSPAR. Published by Elsevier B.V. All rights reserved.

引用

页码：6288 / 6297

页数：10