Location and parameters of a microwave millisecond spike event
文献类型：期刊论文
| 作者 | Huang, GL; Nakajima, H |
| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
 |
| 出版日期 | 2005 |
| 卷号 | 295期号:4页码:423-442 |
| 关键词 | solar solar bursts coronal loops plasma instabilities (LTEX)-T-A |
| ISSN号 | 0004-640X |
| 英文摘要 | A typical microwave millisecond spike event on November 2, 1997 was observed by the radio spectrograph of National Astronomical Observatories (NAOs) at 2.6-3.8 GHz with high time and frequency resolution. This event was also recorded by Nobeyama Radio Polarimeters (NoRP) at 1-35 GHz and Radio Heliograph (NoRH) at 17 GHz. The source at 17 GHz is located in one foot-point of a small bright coronal loop of YOHKOH SXT and SOHO EIT images with strong photospheric magnetic field in SOHO MDI magnetograph. It is assumed that the electron cyclotron maser instability and gyro-resonance absorption dominate, respectively, the rising and decay phase of the spike event. For different harmonic number of gyro-frequency or magnetic field strength, a fitting program with free plasma parameters is used to minimize the difference between the observational and theoretical values of the exponential growth and decay rates for a given spike. The plasma parameters at third harmonic number are more comparable to their typical values in solar corona. Hence, it is able to provide a diagnosis for the source parameters (magnetic field, density, and temperature), the properties of radiations (wave vector and propagation angle), and the properties of non-thermal electrons (density, pitch angle, and energy). The results are also comparable with the diagnosis of the gyro-synchrotron radiation model, the frequency drift rates and a dipole magnetic field model, as well as the YOHKOH SXT and SOHO MDI data. |
| 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] | ELECTRON-CYCLOTRON MASER ; NONTHERMAL ELECTRONS ; RADIO SPIKES ; MAGNETIC-FIELD ; SOLAR CORONA ; LOSS CONE ; EMISSION ; INSTABILITY ; RADIATION ; BURSTS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000227701700001 |
| 公开日期 | 2012-03-07 |
| 源URL | [http://159.226.72.40/handle/332002/4148]  |
| 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, Nanjing 210008, Peoples R China 2.Natl Astron Observ, Beijing, Peoples R China 3.Nobeyama Radio Observ, Minamisa Ku, Nagano 3841305, Japan |
| 推荐引用方式 GB/T 7714 | Huang, GL,Nakajima, H. Location and parameters of a microwave millisecond spike event[J]. ASTROPHYSICS AND SPACE SCIENCE,2005,295(4):423-442. |
| APA | Huang, GL,&Nakajima, H.(2005).Location and parameters of a microwave millisecond spike event.ASTROPHYSICS AND SPACE SCIENCE,295(4),423-442. |
| MLA | Huang, GL,et al."Location and parameters of a microwave millisecond spike event".ASTROPHYSICS AND SPACE SCIENCE 295.4(2005):423-442. |
入库方式： OAI收割
来源：紫金山天文台
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