X-ray source motion along the loop in two solar flares
文献类型：期刊论文
| 作者 | Ning, Zongjun1,2
|
| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
 |
| 出版日期 | 2013-08-01 |
| 卷号 | 346期号:2页码:307-318 |
| 关键词 | Sun: flares Sun: X-ray Bursts, Hard |
| ISSN号 | 0004-640X |
| 通讯作者 | Ning, ZJ (reprint author), Acad Sinica, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China. Email: ningzongjun@pmo.ac.cn |
| 英文摘要 | We explore the 3-8 keV X-ray source motion along the loop legs in two solar flares observed by the Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) on August 12 and November 28, 2002. Firstly, an artificial loop is constructed to have an outline with a fixed width wide enough to cover the X-ray sources at an energy band between 3-60 keV and at various times. Secondly, RHESSI images are reconstructed at 15 energy bands with an 8 s integration window but 1 s cadence. Thirdly, the X-ray source motions are traced from the brightness distribution along the flare loop. We find that these two events tend to start as a single source at 3-8 keV around the loop top, and then separate into two which move downward along the loop legs. These two almost reach the feet of the loop at the hard X-ray (i.e. at 25-50 keV) peak. After that, the two sources move back upward to the loop top and merge together at the same position where they began. The typical timescale is about similar to 70 s, and the maximum speed can reach 1000 km s(-1). Such a downward-to-upward motion along the loop is rarely seen in the observations, and it seems to be consistent with the density evolution at the loop top, first decreasing after heating and then increasing due to evaporation. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MAGNETIC RECONNECTION RATE ; 2003 NOVEMBER 3 ; CHROMOSPHERIC EVAPORATION ; PARTICLE-ACCELERATION ; FOOTPOINT MOTIONS ; 2-RIBBON FLARES ; CURRENT SHEET ; HARD ; RHESSI ; FIELD |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000321214800002 |
| 公开日期 | 2014-01-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/9962]  |
| 专题 | 紫金山天文台_太阳活动的多波段观测研究团组 |
| 作者单位 | 1.Acad Sinica, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China 2.Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ning, Zongjun. X-ray source motion along the loop in two solar flares[J]. ASTROPHYSICS AND SPACE SCIENCE,2013,346(2):307-318. |
| APA | Ning, Zongjun.(2013).X-ray source motion along the loop in two solar flares.ASTROPHYSICS AND SPACE SCIENCE,346(2),307-318. |
| MLA | Ning, Zongjun."X-ray source motion along the loop in two solar flares".ASTROPHYSICS AND SPACE SCIENCE 346.2(2013):307-318. |
入库方式： OAI收割
来源：紫金山天文台
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