Microwave spectral evolution of solar flares
文献类型：期刊论文
| 作者 | Ning, Zongjun ; Ding, Mingde
|
| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
 |
| 出版日期 | 2007 |
| 卷号 | 59期号:2页码:373-379 |
| 关键词 | Sun : activity Sun : flares Sun : radio radiation |
| ISSN号 | 0004-6264 |
| 英文摘要 | We analyze the time evolution of microwave spectral indices for 103 solar flares observed by Nobeyama Radio Polarimeters (NoRP) between 1998 and 2005. The microwave spectral index, gamma(t), is derived from the flux spectral index, delta(t). We assume a flux frequency dependence of the form S(v,t) = F(0)nu(delta(t)) in the optically thin part, i.e., above the turnover frequency, f(max) Here, f(max) is defined as the frequency with the maximum flux among six discrete frequencies (i.e., 1, 2, 3.75, 9.4, 17, and 35 GHz). Based on NoRP observations, we find two typical types of solar flares with various microwave spectral behavior. Type I displays a soft-hard-soft pattern, while the type II flare follows a soft-hard-harder behavior in the rise-peak-decay phases at 35 GHz. Our statistical results of microwave flares confirm previous findings. Most microwave flares appear to be of type II (91 out of the present samples), which is different from the hard X-ray flares dominated by the soft-hard-soft property. Such a difference is an observational constraint for electron acceleration and transport theories in flare models. |
| 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] | HARD X-RAY ; ENERGETIC ELECTRONS ; EMISSION ; BURSTS ; PULSATIONS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000246404000009 |
| 公开日期 | 2012-02-05 |
| 源URL | [http://159.226.72.40/handle/332002/2486]  |
| 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.Purple Mt Observ, Nanjing 210008, Peoples R China 2.Nanjing Univ, Dept Astron, Nanjing 210091, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ning, Zongjun,Ding, Mingde. Microwave spectral evolution of solar flares[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2007,59(2):373-379. |
| APA | Ning, Zongjun,&Ding, Mingde.(2007).Microwave spectral evolution of solar flares.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,59(2),373-379. |
| MLA | Ning, Zongjun,et al."Microwave spectral evolution of solar flares".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 59.2(2007):373-379. |
入库方式： OAI收割
来源：紫金山天文台
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