Observations of Electron-driven Evaporation in a Flare Precursor
文献类型：期刊论文
| 作者 | Li, Dong; Li, Ying; Su, Wei; Huang, Yu; Ning, Zongjun |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018 |
| 卷号 | 854期号:1页码:26 |
| 英文摘要 | We investigate the relationship between the blueshifts of a hot emission line and the nonthermal emissions in microwave and hard X-ray (HXR) wavelengths in the precursor of a solar flare on 2014 October 27. The flare precursor is identified as a small but well-developed peak in the soft X-ray and extreme-ultraviolet passbands before the GOES flare onset, which is accompanied by a pronounced burst in microwave 17 and. 34 GHz and in HXR 25-50 keV. The slit of the Interface Region Imaging Spectrograph (IRIS) stays on one ribbon-like transient during the flare precursor phase, which shows visible nonthermal emissions in Nobeyama Radioheliograph and RHESSI images. The IRIS spectroscopic observations show that the hot line of Fe XXI 1354.09. angstrom (log T similar to 7.05) displays blueshifts, while the cool line of Si IV 1402.77 angstrom (log T similar to 4.8) exhibits redshifts. The blueshifts and redshifts are well correlated with each other, indicative of an explosive chromospheric evaporation during the flare precursor phase combining a high nonthermal energy flux with a short characteristic timescale. In addition, the blueshifts of Fe XXI 1354.09 angstrom are well correlated with the microwave and HXR emissions, implying that the explosive chromospheric evaporation during the flare precursor phase is driven by nonthermal electrons. |
| 语种 | 英语 |
| WOS记录号 | WOS:000424758700001 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/18051]  |
| 专题 | 中国科学院紫金山天文台 |
| 推荐引用方式 GB/T 7714 | Li, Dong,Li, Ying,Su, Wei,et al. Observations of Electron-driven Evaporation in a Flare Precursor[J]. ASTROPHYSICAL JOURNAL,2018,854(1):26. |
| APA | Li, Dong,Li, Ying,Su, Wei,Huang, Yu,&Ning, Zongjun.(2018).Observations of Electron-driven Evaporation in a Flare Precursor.ASTROPHYSICAL JOURNAL,854(1),26. |
| MLA | Li, Dong,et al."Observations of Electron-driven Evaporation in a Flare Precursor".ASTROPHYSICAL JOURNAL 854.1(2018):26. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。