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The extreme solar storm of May 10, 2024, during the 25th solar cycle, which recorded a symmetric H component index (Sym-H) reaching -500 nT, was the strongest since the 2003 Halloween storm. This event offered a unique opportunity for…

太阳与恒星天体物理 · 物理学 2025-09-03 Shibotosh Biswas , Ankush Bhaskar , Anil Raghav , Ajay Kumar , Kalpesh Ghag , Smitha V. Thampi , Vipin K Yadav

Coronal mass ejections (CMEs) and solar energetic particles (SEPs) are two phenomena that can cause severe space weather effects throughout the heliosphere. The evolution of CMEs, especially in terms of their magnetic structure, and the…

We analysed Interface-Region Imaging Spectrograph (IRIS) and the Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA) observations of a small coronal jet that occurred at the solar west limb on 2014 August 29. The jet source…

太阳与恒星天体物理 · 物理学 2024-05-09 Pradeep Kayshap , Judith T. Karpen , Pankaj Kumar

Coronal mass ejections (CMEs) are powerful drivers of space weather, with magnetic flux ropes (MFRs) widely regarded as their primary precursors. However, the variation in reconnection flux during the evolution of MFR during CME eruptions…

太阳与恒星天体物理 · 物理学 2026-04-16 Samriddhi Sankar Maity , Piyali Chatterjee , Ranadeep Sarkar , Ijas S. Mytheen

The goal of this paper is to understand the drivers, configurations, and scenarios of two similar eruptive events, which occurred in the same solar active region 9973 on 2002 June 1 and 2. The June 2 event was previously studied by Sui,…

太阳与恒星天体物理 · 物理学 2009-08-28 N. S. Meshalkina , A. M. Uralov , V. V. Grechnev , A. T. Altyntsev , L. K. Kashapova

JUICE was launched in April 2023, and it is now in its cruise phase to Jupiter, where it is scheduled to arrive in July 2031. JUICE carries a radiation monitor, namely the RADiation hard Electron Monitor (RADEM) to measure protons,…

The B-field structures of two ICMEs each observed by a pair of spacecraft close to radial alignment have been analysed. The ICMEs were observed in situ by MESSENGER and STEREO-B in Nov. 2010 and Nov. 2011, while the spacecraft were…

空间物理 · 物理学 2018-03-28 S. W. Good , R. J. Forsyth , J. P. Eastwood , C. Möstl

We present the first statistical analysis of complexity changes affecting the magnetic structure of interplanetary coronal mass ejections (ICMEs), with the aim of answering the questions: How frequently do ICMEs undergo magnetic complexity…

太阳与恒星天体物理 · 物理学 2022-03-14 Camilla Scolini , Réka M. Winslow , Noé Lugaz , Tarik M. Salman , Emma E. Davies , Antoinette B. Galvin

Flux transfer events (FTEs) are a type of magnetospheric phenomena that exhibit distinctive observational signatures from the in-situ spacecraft measurements across the Earth's magnetopause. They are generally believed to possess a magnetic…

空间物理 · 物理学 2023-09-20 Shuo Wang , Ying Zou , Qiang Hu , Xueling Shi , Hiroshi Hasegawa

We present study of the complex event consisting of several solar wind transients detected by Advanced Composition Explorer (ACE) on 4 -- 7 August 2011, that caused a geomagnetic storm with Dst$=-$110 nT. The supposed coronal sources --…

空间物理 · 物理学 2017-05-12 D. Rodkin , F. Goryaev , P. Pagano , G. Gibb , V. Slemzin , Yu. Shugay , I. Veselovsky , D. H. Mackay

Coronal mass ejections (CMEs) and their driven shocks are a major source of large geomagnetic storms due to their large and long-lasting, southward component of magnetic field in the sheath and the flux rope (e.g., magnetic cloud).…

太阳与恒星天体物理 · 物理学 2024-06-21 Chin-Chun Wu , Kan Liou , Brian Wood , Keiji Hayashi

Interplanetary coronal mass ejections (ICMEs), the large-scale eruptive phenomena capable of shedding a huge amount of solar magnetic helicity and energy are potential in driving strong geomagnetic storms. They complexly evolve while…

太阳与恒星天体物理 · 物理学 2025-10-22 Sanchita Pal , Cecilia Mac Cormack , Emilia K. J. Kilpua , Yogesh , Lan K. Jian , Teresa Nieves-Chinchilla

Interplanetary coronal mass ejections (ICMEs) observed by the MESSENGER (MES) and Venus Express (VEX) spacecraft have been catalogued and analysed. The ICMEs were identified by a relatively smooth rotation of the magnetic field direction…

空间物理 · 物理学 2016-01-20 S. W. Good , R. J. Forsyth

A comprehensive analysis of plasma and composition characteristics inside magnetic clouds (MCs) observed by the Advanced Composition Explorer (ACE) spacecraft from 1998 February to 2011 August is presented. The results show that MCs have…

太阳与恒星天体物理 · 物理学 2020-05-06 Jin Huang , Yu Liu , Hengqiang Feng , Ake Zhao , Z. Z. Abidin , Yuandeng Shen , Oloketuyi Jacob

Jupiter's weather layer exhibits long-term and quasi-periodic cycles of meteorological activity that can completely change the appearance of its belts and zones. There are cycles with intervals from 4 to 9 years, dependent on the latitude,…

地球与行星天体物理 · 物理学 2023-05-23 Kumiko Hori , Chris A. Jones , Arrate Antuñano , Leigh N. Fletcher , Steven M. Tobias

Understanding the relationship between magnetic flux ropes and magnetic reconnection is fundamental to both space and astrophysical plasma studies. In this study, we report on two consecutive heliospheric current sheet (HCS) crossings by…

太阳与恒星天体物理 · 物理学 2026-05-13 Dae-Young Lee , Dooyoung Choi , Kyung-Eun Choi , Sung Jun Noh

Coronal mass ejections (CMEs) are the most spectacular eruptive phenomena in the solar atmosphere. It is generally accepted that CMEs are results of eruptions of magnetic flux ropes (MFRs). However, a heated debate is on whether MFRs…

太阳与恒星天体物理 · 物理学 2015-06-22 Hongqiang Song , Jie Zhang , Yao Chen , Xin Cheng

Events which meet certain criteria from star tracker images onboard the Juno spacecraft have been proposed to be due to interplanetary dust particle impacts on its solar arrays. These events have been suggested to be caused by particles…

地球与行星天体物理 · 物理学 2022-02-07 Petr Pokorný , Jamey R. Szalay , Mihály Horányi , Marc J. Kuchner

On July 25 2017 a multi-step Forbush decrease (FD) with the remarkable total amplitude of more than 15\% was observed by MSL/RAD at Mars. We find that these particle signatures are related to very pronounced plasma and magnetic field…

We present CO ($J = 1-0$) multi-line observations toward the L914 dark cloud in the vicinity of the Cygnus X region, using the 13.7 m millimeter telescope of the Purple Mountain Observatory (PMO). The CO observations reveal in the L914…

星系天体物理 · 物理学 2024-03-06 Li Sun , Xuepeng Chen , Min Fang , Shaobo Zhang , Yan Gong , Jiancheng Feng , Xuefu Li , Qing-Zeng Yan , Ji Yang