Institutional Repository of Optical Astronomy Research Laboratory
| EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES | |
Shen, Jinhua1,2 ; Zhou, Tuanhui2; Ji, Haisheng2,3; Wang, Na1; Cao, Wenda3; Wang, Haimin3
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| 2008-10-10 | |
| Source Publication | ASTROPHYSICAL JOURNAL LETTERS
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| Volume | 686Issue:1Pages:L37-L40 |
| Contribution Rank | 1 |
| Abstract | This Letter is to investigate the physics of a newly discovered phenomenon-contracting flare loops in the early phase of solar flares. In classical flare models, which were constructed based on the phenomenon of the expansion of flare loops, an energy releasing site is put above flare loops. These models can predict that there is a vertical temperature gradient in the top of flare loops due to heat conduction and cooling effects. Therefore, the centroid of an X-ray loop-top source at higher energy bands will be higher in altitude, which we can define as the normal temperature distribution. With observations made by RHESSI, we analyzed 10 M- or X-class flares (9 limb flares). For all these flares, the movement of loop-top sources shows an obvious U-shaped trajectory, which we take as the signature of contraction-to-expansion of flare loops. We find that, for all these flares, a normal temperature distribution does exist, but only along the path of expansion. The temperature distribution along the path of contraction is abnormal, showing no spatial order at all. The result suggests that magnetic reconnection processes in the contraction and expansion phases of these solar flares are different. |
| Keyword | Sun: Flares Sun: Magnetic Fields Sun: X-rays Gamma Rays |
| Subtype | Article |
| WOS Headings | Science & Technology ; Physical Sciences |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | MAGNETIC RECONNECTION ; CURRENT SHEET ; RHESSI ; RELAXATION ; SIGNATURE |
| WOS Research Area | Astronomy & Astrophysics |
| WOS Subject | Astronomy & Astrophysics |
| WOS ID | WOS:000262731200010 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.xao.ac.cn/handle/45760611-7/820 |
| Collection | 光学天文与技术应用研究室 其它 |
| Affiliation | 1.Natl Astron Observ, Urumqi Observ, Urumqi 830011, Peoples R China 2.Purple Mt Observ, Nanjing 210008, Peoples R China 3.New Jersey Inst Technol, Ctr Solar Terr Res, Newark, NJ 07102 USA |
| First Author Affilication | Xinjiang Astronomical Observatory, Chinese Academy of Sciences |
| Recommended Citation GB/T 7714 | Shen, Jinhua,Zhou, Tuanhui,Ji, Haisheng,et al. EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES[J]. ASTROPHYSICAL JOURNAL LETTERS,2008,686(1):L37-L40. |
| APA | Shen, Jinhua,Zhou, Tuanhui,Ji, Haisheng,Wang, Na,Cao, Wenda,&Wang, Haimin.(2008).EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES.ASTROPHYSICAL JOURNAL LETTERS,686(1),L37-L40. |
| MLA | Shen, Jinhua,et al."EARLY ABNORMAL TEMPERATURE STRUCTURE OF X-RAY LOOP-TOP SOURCE OF SOLAR FLARES".ASTROPHYSICAL JOURNAL LETTERS 686.1(2008):L37-L40. |
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| File Name/Size | DocType | Version | Access | License | ||
| Shen-2008-EARLY ABNO（307KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Application Full Text | |
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