STATISTICAL ANALYSIS OF FLARING LOOPS OBSERVED BY NOBEYAMA RADIOHELIOGRAPH. I. COMPARISON OF LOOPTOP AND FOOTPOINTS
文献类型：期刊论文
| 作者 | Huang, Guangli1; Nakajima, Hiroshi2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2009-05-01 |
| 卷号 | 696期号:1页码:136-142 |
| 关键词 | Sun: flares Sun: magnetic fields Sun: radio radiation |
| ISSN号 | 0004-637X |
| 英文摘要 | Twenty-four events with looplike structures at 17 and 34 GHz are selected from the flare list of Nobeyama Radioheliograph. We obtained the brightness temperatures at 17 and 34 GHz, the polarization degrees at 17 GHz, and the power-law spectral indices at the radio peak time for one looptop (LT) and two footpoints (FPs) of each event. We also calculated the magnetic field strengths and the column depths of nonthermal electrons in the LT and FPs of each event, using the equations modified from the gyrosynchrotron equations by Dulk. The main statistical results from those data are summarized as follows. (1) The spectral indices, the brightness temperatures at 17 and 34 GHz, the polarization degrees at 17 GHz, the calculated magnetic field strengths, and the calculated column densities of nonthermal electrons are always positively correlated between the LT and the two FPs of the selected events. (2) About one-half of the events have the brightest LT at 17 and 34 GHz. (3) The spectral indices in the two FPs are larger (softer) than those in the corresponding LT in most events. (4) The calculated magnetic field strengths in the two FPs are always larger than those in the corresponding LT. (5) Most of the events have the same positive or negative polarization sense in the LT and the two FPs. (6) The brightness temperatures at 17 and 34 GHz in each of the LT and the two FPs statistically decrease with their spectral indices and the calculated magnetic field strengths, but increase with their calculated column densities of nonthermal electrons. Moreover, we try to discuss the possible causes of the present statistical results. |
| 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] | SOLAR MICROWAVE-BURSTS ; SPATIAL-DISTRIBUTION ; MAGNETIC-FIELD ; RADIO-EMISSION ; FLARES ; POLARIZATION ; MODEL ; TOP ; PROPAGATION ; ELECTRONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000265350100013 |
| 公开日期 | 2011-12-08 |
| 源URL | [http://159.226.72.40/handle/332002/1545]  |
| 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.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Nobeyama Radio Observ, Minamimaki, Nagano 3841305, Japan |
| 推荐引用方式 GB/T 7714 | Huang, Guangli,Nakajima, Hiroshi. STATISTICAL ANALYSIS OF FLARING LOOPS OBSERVED BY NOBEYAMA RADIOHELIOGRAPH. I. COMPARISON OF LOOPTOP AND FOOTPOINTS[J]. ASTROPHYSICAL JOURNAL,2009,696(1):136-142. |
| APA | Huang, Guangli,&Nakajima, Hiroshi.(2009).STATISTICAL ANALYSIS OF FLARING LOOPS OBSERVED BY NOBEYAMA RADIOHELIOGRAPH. I. COMPARISON OF LOOPTOP AND FOOTPOINTS.ASTROPHYSICAL JOURNAL,696(1),136-142. |
| MLA | Huang, Guangli,et al."STATISTICAL ANALYSIS OF FLARING LOOPS OBSERVED BY NOBEYAMA RADIOHELIOGRAPH. I. COMPARISON OF LOOPTOP AND FOOTPOINTS".ASTROPHYSICAL JOURNAL 696.1(2009):136-142. |
入库方式： OAI收割
来源：紫金山天文台
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