Millisecond microwave spikes: Statistical study and application for plasma diagnostics
文献类型：期刊论文
| 作者 | Rozhansky, I. V.1,2; Fleishman, G. D.2,3; Huang, G. -L.1 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2008-07-10 |
| 卷号 | 681期号:2页码:1688-1697 |
| 关键词 | acceleration of particles radiation mechanisms : nonthermal sun : flares sun : radio radiation turbulence |
| ISSN号 | 0004-637X |
| 英文摘要 | We analyze a dense cluster of solar radio spikes registered at 4.5-6 GHz by the Purple Mountain Observatory spectrometer (Nanjing, China), operating in the 4.5-7.5 GHz range with 5 ms temporal resolution. To handle the data from the spectrometer, we developed a new technique that uses a nonlinear multi-Gaussian spectral fit based on X-2 criteria to extract individual spikes from the originally recorded spectra. Applying this method to the experimental raw data, we eventually identified about 3000 spikes for this event, which allows us to make a detailed statistical analysis. Various statistical characteristics of the spikes have been evaluated, including the intensity distributions, the spectral bandwidth distributions, and the distribution of the spike mean frequencies. The most striking finding of this analysis is the distributions of the spike bandwidth, which are remarkably asymmetric. To reveal the underlaying microphysics, we explore the local-trap model with the renormalized theory of spectral profiles of the electron cyclotron maser (ECM) emission peak in a source with random magnetic irregularities. The distribution of the solar spike relative bandwidths calculated within the local-trap model represents an excellent fit to the experimental data. Accordingly, the developed technique may offer a new tool with which to study very low levels of magnetic turbulence in the spike sources, when the ECM mechanism of the spike cluster is confirmed. |
| 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 ; BAND DM-SPIKES ; AURORAL KILOMETRIC RADIATION ; QUASI-LINEAR DIFFUSION ; RADIO SPIKES ; SOLAR-FLARES ; LOSS-CONE ; FINE-STRUCTURE ; APRIL 10 ; EMISSION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000257516000075 |
| 公开日期 | 2011-12-30 |
| 源URL | [http://159.226.72.40/handle/332002/2021]  |
| 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.Natl Astron Observ, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Ioffe Inst Phys & Technol, St Petersburg 194021, Russia 3.New Jersey Inst Technol, Newark, NJ 07102 USA |
| 推荐引用方式 GB/T 7714 | Rozhansky, I. V.,Fleishman, G. D.,Huang, G. -L.. Millisecond microwave spikes: Statistical study and application for plasma diagnostics[J]. ASTROPHYSICAL JOURNAL,2008,681(2):1688-1697. |
| APA | Rozhansky, I. V.,Fleishman, G. D.,&Huang, G. -L..(2008).Millisecond microwave spikes: Statistical study and application for plasma diagnostics.ASTROPHYSICAL JOURNAL,681(2),1688-1697. |
| MLA | Rozhansky, I. V.,et al."Millisecond microwave spikes: Statistical study and application for plasma diagnostics".ASTROPHYSICAL JOURNAL 681.2(2008):1688-1697. |
入库方式： OAI收割
来源：紫金山天文台
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