Calculations of the low-cutoff energy of non-thermal electrons in solar microwave and hard X-ray bursts
文献类型：期刊论文
| 作者 | Huang, GL; Zhou, AH; Su, YN ; Zhang, J
|
| 刊名 | NEW ASTRONOMY
 |
| 出版日期 | 2005 |
| 卷号 | 10期号:3页码:219-236 |
| 关键词 | sun : flares bursts energetic solar particles photons |
| ISSN号 | 1384-1092 |
| 英文摘要 | Two independent methods are proposed to estimate the low-cutoff energy of non-thermal electrons in solar microwave and hard X-ray bursts. At first, the observed ratio of radio flux at two frequencies (or hard X-ray count at two energies) are compared with the models based on the non-thermal gyro-synchrotron (or bremsstrahlung) radiations, excited by non-thermal electrons with a single power-law distribution, in which the low-cutoff energy is considered as the only free parameter. Some other parameters are cancelled by the ratio (such as the coefficient of the power-law distribution of non-thermal electrons), or fixed due to the insensitivity (such as the high-cutoff energy, the ambient density and temperature), or calculated from the other observations (such as the magnetic field). Secondly, the cross-point of the power-law distributions at different time of microwave or hard X-ray bursts is suggested to estimate the low or high-cutoff energies of non-thermal electrons. Two impulsive microwave bursts by Owens-Valley Solar Arrays (OVSA) associated with hard X-ray bursts by YOHKOH/HXT are selected to eliminate the contribution of thermal component around the peak time with plasma temperature of 10(6) - 10(7) K. The energy at the cross-points in two hard X-ray bursts is comparable with the low-cutoffs to fit the microwave and hard X-ray data at different times of the impulsive phase, i.e., 10 - 50 keV. These two methods can be applied only when a single power-law distribution is acceptable between the two frequency (or energy) channels in microwave (or hard X-ray) bursts. (C) 2004 Elsevier B.V. All rights reserved. |
| 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] | THERMAL ELECTRONS ; MAGNETIC-FIELD ; SPECTRA ; FLARES ; EMISSION ; DENSITY ; MODEL |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000226385600005 |
| 公开日期 | 2012-03-07 |
| 源URL | [http://159.226.72.40/handle/332002/4150]  |
| 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.Chinese Natl Astron Observ, Beijing 100012, Peoples R China 3.Beijing Univ, Dept Astron, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Huang, GL,Zhou, AH,Su, YN,et al. Calculations of the low-cutoff energy of non-thermal electrons in solar microwave and hard X-ray bursts[J]. NEW ASTRONOMY,2005,10(3):219-236. |
| APA | Huang, GL,Zhou, AH,Su, YN,&Zhang, J.(2005).Calculations of the low-cutoff energy of non-thermal electrons in solar microwave and hard X-ray bursts.NEW ASTRONOMY,10(3),219-236. |
| MLA | Huang, GL,et al."Calculations of the low-cutoff energy of non-thermal electrons in solar microwave and hard X-ray bursts".NEW ASTRONOMY 10.3(2005):219-236. |
入库方式： OAI收割
来源：紫金山天文台
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