Huang, Jin and Liu, Yu and Feng, Hengqiang and Zhao, Ake and Abidin, Z. Z. and Shen, Yuandeng and Oloketuyi, Jacob (2020) A statistical study of the plasma and composition distribution inside magnetic clouds: 1998-2011. Astrophysical Journal, 893 (2). ISSN 0004-637X, DOI https://doi.org/10.3847/1538-4357/ab7a28.
Full text not available from this repository.Abstract
A comprehensive analysis of plasma and composition characteristics inside magnetic clouds (MCs) observed by the Advanced Composition Explorer spacecraft from 1998 February to 2011 August is presented. The results show that MCs have specific interior structures, and MCs of different speeds show differences in composition and structure. Compared with the slow MCs, fast MCs have enhanced mean charge states of iron, oxygen, silicon, magnesium, O7+ O6+, C6+ C5+, C6+ C4+, and Fe. 16+ Fe total values. For ionic species in fast MCs, a higher atomic number represents a greater enhancement of mean charge state than slow MCs. We also find that both the fast and slow MCs display bimodal structure distribution in the mean iron charge state (aQnFe), which suggests that the existence of flux rope prior to the eruption is common. Furthermore, the aQnFe, Fe.16+ Fe total, and O + O +7 6 ratio distribution inside fast MCs have the feature that the posterior peak is higher than the anterior one. This result agrees with the ``standard model'' for coronal mass ejection/flares, by which magnetic reconnection occurs beneath the flux rope, thereby ionizing the ions of the posterior part of the flux rope sufficiently by high-energy electron collisions or by direct heating in the reconnection region.
| Item Type: | Article |
|---|---|
| Funders: | National Scientific Foundation of China [Grant No: NSFC 11533009, 11973086], University of Malaya Faculty of Science [Grant No: GPF040B-2018], Chinese Academy of Sciences [Grant No: XDA-17040507] |
| Uncontrolled Keywords: | Solar wind; Solar coronal mass ejections; Interplanetary physics; Solar physics; Solar storm; Solar flares; Solar filament eruptions; Solar filaments |
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Department of Physics |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 06 Nov 2024 01:32 |
| Last Modified: | 06 Nov 2024 01:32 |
| URI: | http://eprints.um.edu.my/id/eprint/36785 |
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