The radio signature of twisted magnetic ropes and reconnection site in the low corona
文献类型：期刊论文
| 作者 | Huang, GL; Wu, HA; Grechnev, VV; Sych, RA; Altyntsev, AT |
| 刊名 | SOLAR PHYSICS
 |
| 出版日期 | 2003-04-01 |
| 卷号 | 213期号:2页码:341-358 |
| 关键词 | SOLAR MICROWAVE-BURSTS FLUX ROPES NONTHERMAL ELECTRONS III BURSTS EMISSION FLARES BAND PULSATIONS RADIATION DENSITY |
| ISSN号 | 0038-0938 |
| 英文摘要 | A solar radio burst on 25 August 1999 with fine structures (FS) at 4.5 - 7.5 GHz is studied in this paper. The FS started about one minute prior to the main burst. The maximum emission took place at 4 - 5 GHz for the FS, and at 10 - 11 GHz for the main burst, respectively. The time profiles at 4.5 - 7.5 GHz coincide very well with those of hard X-rays ( from 25 keV to > 300 keV) in both the main burst and the FS, which shows that the same population of accelerated electrons is responsible for both the microwave and hard X-ray bursts. The source of FS is 20 arc sec away from the main source close to a compact dipolar magnetic field, which is confirmed by different time and polarization profiles in the FS and main sources. It is interesting that the FS at 4.5 - 7.5 GHz are associated with a series of twisted magnetic loops or ropes, which may be modulated by Alfven waves with a period of 1 s and a spatial wavelength of 10(3) km in respect to the typical Alfven velocity of 10(3) km s(-1) in corona. These magnetic ropes may be rooted in the dipole site, which extended into the corona during the event and retracted after the event. Therefore, the FS in this event may show an important signature or precursor for energy release. The magnetic reconnection may be triggered by the interaction of the magnetic ropes at the height corresponding to 5 - 6 GHz, followed by cascaded energy release close to the foot-point of the magnetic ropes. |
| 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] | SOLAR MICROWAVE-BURSTS ; FLUX ROPES ; NONTHERMAL ELECTRONS ; III BURSTS ; EMISSION ; FLARES ; BAND ; PULSATIONS ; RADIATION ; DENSITY |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000183109100008 |
| 公开日期 | 2012-08-08 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/4617]  |
| 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.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Natl Astron Observ, Beijing 100012, Peoples R China 3.RAS, Inst Solar Terr Phys SD, Irkutsk, Russia |
| 推荐引用方式 GB/T 7714 | Huang, GL,Wu, HA,Grechnev, VV,et al. The radio signature of twisted magnetic ropes and reconnection site in the low corona[J]. SOLAR PHYSICS,2003,213(2):341-358. |
| APA | Huang, GL,Wu, HA,Grechnev, VV,Sych, RA,&Altyntsev, AT.(2003).The radio signature of twisted magnetic ropes and reconnection site in the low corona.SOLAR PHYSICS,213(2),341-358. |
| MLA | Huang, GL,et al."The radio signature of twisted magnetic ropes and reconnection site in the low corona".SOLAR PHYSICS 213.2(2003):341-358. |
入库方式： OAI收割
来源：紫金山天文台
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