2002 AUGUST 24 LIMB FLARE LOOP: DYNAMICS OF MICROWAVE BRIGHTNESS DISTRIBUTION
文献类型：期刊论文
| 作者 | Reznikova, V. E.1,2; Melnikov, V. F.2,3; Shibasaki, K.4; Gorbikov, S. P.2; Pyatakov, N. P.2; Myagkova, I. N.5; Ji, H.1,6 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2009-05-20 |
| 卷号 | 697期号:1页码:735-746 |
| 关键词 | acceleration of particles Sun: flares Sun: radio radiation Sun: X-rays, gamma rays |
| ISSN号 | 0004-637X |
| 英文摘要 | High-resolution radio observation of Nobeyama Radioheliograph at 17 and 34 GHz allowed studying the dynamics of microwave brightness distribution along the giant limb flaring loop in the event of 2002 August 24. It is found that on the rising phase of the radio burst the brightness distribution was highly asymmetric, with a strong maximum near the southern footpoint (SFP) and much weaker brightness enhancements near the loop top (LT) and northern footpoint. On the decay phase, the LT gradually became most bright. The similar dynamics of brightness distribution are shown to happen for all major temporal subpeaks of the burst. Results of our diagnostics show two important properties: (1) the number density of mildly relativistic electrons in the LT is much higher than near the footpoints (FPs) during rise, maximum and decay of each major peak; and (2) the ratio of the electron number densities in the LT and an FP increases from the maximum to decay phase. Model simulations with making use of the nonstationary Fokker-Planck equation have allowed us to find the model explaining the major properties of the microwave brightness distribution and dynamics. The model is characterized by a compact source of electrons located near the center of an asymmetric magnetic loop; the source is nonstationary, long lasting, and injecting high-energy electrons with the pitch-angle distribution mostly directed toward the SFP but also having a very weak isotropic component. This easily explains the observed brightness asymmetry. The observed dynamics comes due to two reasons: faster precipitation of electrons having their mirror points near the ends of the magnetic trap, and relatively faster decay of the lower energy electrons responsible for the gyrosynchrotron emission near the FPs with higher magnetic field. |
| 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] | HIGH-ENERGY ELECTRONS ; SOLAR-FLARES ; NOBEYAMA RADIOHELIOGRAPH ; GYROSYNCHROTRON EMISSION ; X-RAYS ; BURSTS ; PLASMA ; MORPHOLOGIES ; PROPAGATION ; REGION |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000265764000062 |
| 公开日期 | 2011-12-08 |
| 源URL | [http://159.226.72.40/handle/332002/1737]  |
| 专题 | 紫金山天文台_近地天体探测和太阳系天体研究团组 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Radiophys Res Inst NIRFI, Nizhnii Novgorod 603950, Russia 3.Pulkovo Astron Observ, St Petersburg 196140, Russia 4.Natl Inst Nat Sci, Natl Astron Observ Japan, Nobeyama Solar Radio Observ, Minamimaki, Nagano 3841305, Japan 5.Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow, Russia 6.New Jersey Inst Technol, Big Bear Solar Observ, Big Bear City, CA 92314 USA |
| 推荐引用方式 GB/T 7714 | Reznikova, V. E.,Melnikov, V. F.,Shibasaki, K.,et al. 2002 AUGUST 24 LIMB FLARE LOOP: DYNAMICS OF MICROWAVE BRIGHTNESS DISTRIBUTION[J]. ASTROPHYSICAL JOURNAL,2009,697(1):735-746. |
| APA | Reznikova, V. E..,Melnikov, V. F..,Shibasaki, K..,Gorbikov, S. P..,Pyatakov, N. P..,...&Ji, H..(2009).2002 AUGUST 24 LIMB FLARE LOOP: DYNAMICS OF MICROWAVE BRIGHTNESS DISTRIBUTION.ASTROPHYSICAL JOURNAL,697(1),735-746. |
| MLA | Reznikova, V. E.,et al."2002 AUGUST 24 LIMB FLARE LOOP: DYNAMICS OF MICROWAVE BRIGHTNESS DISTRIBUTION".ASTROPHYSICAL JOURNAL 697.1(2009):735-746. |
入库方式： OAI收割
来源：紫金山天文台
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