Transient galactic cosmic-ray modulation during solar cycle 24: a comparative study of two prominent forbush decrease events
文献类型：期刊论文
| 作者 | Zhao, L. -L.1,2; Zhang, H.1 |
| 刊名 | Astrophysical journal
 |
| 出版日期 | 2016-08-10 |
| 卷号 | 827期号:1页码:10 |
| 关键词 | Cosmic rays Sun: activity Sun: coronal mass ejections (cmes) |
| ISSN号 | 0004-637X |
| DOI | 10.3847/0004-637x/827/1/13 |
| 通讯作者 | Zhao, l. -l.(zhaolingling@ucas.edu.cn) |
| 英文摘要 | Forbush decrease (fd) events are of great interest for transient galactic cosmic-ray (gcr) modulation study. in this study, we perform comparative analysis of two prominent forbush events during cycle 24, occurring on 2012 march 8 (event 1) and 2015 june 22 (event 2), utilizing the measurements from the worldwide neutron monitor (nm) network. despite. their comparable magnitudes, the two forbush events are distinctly different in terms of evolving gcr energy spectrum and energy dependence of the recovery time. the recovery time of event 1 is strongly dependent on the median energy, compared to the nearly constant recovery time of event 2 over the studied energy range. additionally, while the evolutions of the energy spectra during the two fd events exhibit similar variation patterns, the spectrum of event 2 is significantly harder, especially at the time of deepest depression. these difference are essentially related to their associated solar wind disturbances. event 1 is associated with a complicated shock-associated interplanetary coronal mass ejection (icme) disturbance with large radial extent, probably formed by the merging of multiple shocks and transient flows, and which delivered a glancing blow to earth. conversely, event 2 is accompanied by a relatively simple halo icme with small radial extent that hit earth more head-on. |
| WOS关键词 | CORONAL MASS EJECTIONS ; RECENT MAGNETIC STORM ; TO-EARTH PROPAGATION ; RIGIDITY SPECTRUM ; ENERGY-DEPENDENCE ; INTENSITY ; RADIATION ; RECOVERY ; SPACE |
| WOS研究方向 | Astronomy & Astrophysics |
| WOS类目 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000382009500013 |
| 出版者 | IOP PUBLISHING LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2376344 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Zhao, L. -L. |
| 作者单位 | 1.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China 2.Macau Univ Sci & Technol, Lunar & Planetary Sci Lab, Macau, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, L. -L.,Zhang, H.. Transient galactic cosmic-ray modulation during solar cycle 24: a comparative study of two prominent forbush decrease events[J]. Astrophysical journal,2016,827(1):10. |
| APA | Zhao, L. -L.,&Zhang, H..(2016).Transient galactic cosmic-ray modulation during solar cycle 24: a comparative study of two prominent forbush decrease events.Astrophysical journal,827(1),10. |
| MLA | Zhao, L. -L.,et al."Transient galactic cosmic-ray modulation during solar cycle 24: a comparative study of two prominent forbush decrease events".Astrophysical journal 827.1(2016):10. |
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来源：中国科学院大学
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