Effect of random inhomogeneities on electron cyclotron maser emission
文献类型：期刊论文
| 作者 | Fleishman, GD |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2004-01-20 |
| 卷号 | 601期号:1页码:559-564 |
| 关键词 | acceleration of particles Sun : flares Sun : particle emission Sun : radio radiation |
| ISSN号 | 0004-637X |
| 英文摘要 | The spectral properties of solar radio spikes are believed to be tightly related to the spike source inhomogeneity: in particular, the spikes display a rather large scatter of spectral bandwidth of the emission lines both within one event and from one event to another. This paper studies the effect of random magnetic and density inhomogeneities on the spectral properties of the electron cyclotron maser emission produced by superthermal electrons, which is likely responsible for solar radio spikes. Magnetic irregularities with a broad distribution over spatial scales are shown to provide considerable spectral broadening that is not necessarily small compared to the natural bandwidth, even for small magnetic inhomogeneities. The developed renormalization scheme allows us to describe quantitatively the spectral shape of the emission line when the broadening is large. Moreover, the presence of stronger magnetic inhomogeneities gives rise to the splitting of the emission line into two peaks, in agreement with the observed noninteger harmonic ratio between spectrally separated spike bands. Typical values of the spectral bandwidth are found to be fairly consistent with spike observations. The developed theory suggests new possibilities for random magnetic field diagnostics. The estimated magnitudes of the random magnetic field at the spike source look rather reasonable. |
| 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-FLARES ; RADIO SPIKES ; LOSS-CONE ; MILLISECOND SPIKES ; BURSTS ; INSTABILITIES ; RADIATION ; BANDWIDTH ; CORONA ; RATIO |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000188657600048 |
| 公开日期 | 2012-12-22 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/7767]  |
| 专题 | 紫金山天文台_期刊（老文献） |
| 作者单位 | 1.Natl Astron Observ, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Ioffe Inst Phys & Technol, St Petersburg 194021, Russia |
| 推荐引用方式 GB/T 7714 | Fleishman, GD. Effect of random inhomogeneities on electron cyclotron maser emission[J]. ASTROPHYSICAL JOURNAL,2004,601(1):559-564. |
| APA | Fleishman, GD.(2004).Effect of random inhomogeneities on electron cyclotron maser emission.ASTROPHYSICAL JOURNAL,601(1),559-564. |
| MLA | Fleishman, GD."Effect of random inhomogeneities on electron cyclotron maser emission".ASTROPHYSICAL JOURNAL 601.1(2004):559-564. |
入库方式： OAI收割
来源：紫金山天文台
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