ONSET OF ELECTRON ACCELERATION IN A FLARE LOOP
文献类型：期刊论文
| 作者 | Sharykin, Ivan1,2; Liu, Siming1 ; Fletcher, Lyndsay3
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2014-09-20 |
| 卷号 | 793期号:1页码:0 |
| ISSN号 | 0004-637X |
| 关键词 | acceleration of particles plasmas Sun: flares Sun: radio radiation Sun: X-rays, gamma rays turbulence |
| 英文摘要 | We carried out a detailed analysis of X-ray and radio observations of a simple flare loop that occurred on 2002 August 12, with the impulsive hard X-ray (HXR) light curves dominated by a single pulse. The emission spectra of the early impulsive phase are consistent with an isothermal model in the coronal loop with a temperature reaching several keV. A power-law high-energy spectral tail is evident near the HXR peak time, in accordance with the appearance of footpoints at high energies, and is well correlated with the radio emission. The energy content of the thermal component keeps increasing gradually after the disappearance of this nonthermal component. These results suggest that electron acceleration only covers the central period of a longer and more gradual energy dissipation process and that the electron transport within the loop plays a crucial role in the formation of the inferred power-law electron distribution. The spectral index of power-law photons shows a very gradual evolution, indicating that the electron accelerator is in a quasi-steady state, which is confirmed by radio observations. These results are consistent with the theory of stochastic electron acceleration from a thermal background. Advanced modeling with coupled electron acceleration and spatial transport processes is needed to explain these observations more quantitatively, which may reveal the dependence of the electron acceleration on the spatial structure of the acceleration region. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | HARD X-RAY ; ENERGY-RELEASE EVENTS ; SOLAR-FLARES ; STOCHASTIC ACCELERATION ; PARTICLE-ACCELERATION ; CHROMOSPHERIC EVAPORATION ; IMPULSIVE PHASE ; CORONAL LOOPS ; TRANSPORT ; EMISSION |
| 收录类别 | SCI |
| 原文出处 | 10.1088/0004-637X/793/1/25 |
| 语种 | 英语 |
| WOS记录号 | WOS:000341301700025 |
| 公开日期 | 2014-11-20 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10624]  |
| 专题 | 紫金山天文台_太阳高能及相关物理过程研究团组 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China 2.Russian Acad Sci, Space Res Inst IKI, Moscow 117997, Russia 3.Univ Glasgow, Sch Phys & Astron, SUPA, Glasgow G12 8QQ, Lanark, Scotland |
| 推荐引用方式 GB/T 7714 | Sharykin, Ivan,Liu, Siming,Fletcher, Lyndsay. ONSET OF ELECTRON ACCELERATION IN A FLARE LOOP[J]. ASTROPHYSICAL JOURNAL,2014,793(1):0. |
| APA | Sharykin, Ivan,Liu, Siming,&Fletcher, Lyndsay.(2014).ONSET OF ELECTRON ACCELERATION IN A FLARE LOOP.ASTROPHYSICAL JOURNAL,793(1),0. |
| MLA | Sharykin, Ivan,et al."ONSET OF ELECTRON ACCELERATION IN A FLARE LOOP".ASTROPHYSICAL JOURNAL 793.1(2014):0. |
入库方式： OAI收割
来源：紫金山天文台
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