A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare
文献类型：期刊论文
| 作者 | Li, H ; You, J
|
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2001-08-01 |
| 卷号 | 374期号:3页码:1121-1126 |
| ISSN号 | 1432-0746 |
| 关键词 | Sun : flares Sun : infrared line : profiles |
| 英文摘要 | The He I 10 830 Angstrom spectra observed in the impulsive phase of the 2N/X20 solar limb are of 16 August 1989 show unusually broad profiles, and most of the profiles are blue-shifted and/or blue asymmetric with full-width-at-half-maximum (FWHM) greater than 10 Angstrom. Contrary to prominences, weak post-flare loops and surges, the observed profiles of the are cannot be simulated by Doppler broadening with a uniform flaring atmosphere model. Calculations show that only when the electron density is greater than 10(16) cm(-3) can Stark broadening produce an obvious in fence on the He I 10 830 Angstrom profile. This indicates that it is not plausible that Stark broadening leads to the observed profiles even though they can be fitted by Stark broadening. Alternatively, an expanding flaring atmosphere can perfectly simulate all the observed He I 10 830 Angstrom profiles. The expanding velocities are generally several tens of km s(-1) and that corresponding to the widest profile is greater than 120 km s(-1). Expanding velocity and other parameters vary with time and the observed area. This expanding flaring atmosphere model is a perspective candidate for line broadening. It is an indication of the lateral expansion resulting from rapid chromospheric heating in addition to the upward evaporation and downward condensation. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | CHROMOSPHERIC EVAPORATION ; IMPULSIVE PHASE ; SOLAR-FLARES ; SPECTRA ; BEAM |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000170215900035 |
| 公开日期 | 2013-01-31 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/8195]  |
| 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 | Acad Sinica, Purple Mt Observ, Natl Astron Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, H,You, J. A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare[J]. ASTRONOMY & ASTROPHYSICS,2001,374(3):1121-1126. |
| APA | Li, H,&You, J.(2001).A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare.ASTRONOMY & ASTROPHYSICS,374(3),1121-1126. |
| MLA | Li, H,et al."A possible broadening mechanism of HeI 10 830 angstrom profiles observed in a limb flare".ASTRONOMY & ASTROPHYSICS 374.3(2001):1121-1126. |
入库方式： OAI收割
来源：紫金山天文台
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