Radio and multiwavelength evidence of coronal loop eruption in a flare-coronal mass ejection event on 15 April 1998

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳活动的多波段观测研究团组

	Radio and multiwavelength evidence of coronal loop eruption in a flare-coronal mass ejection event on 15 April 1998
	Huang, GL
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2004-02-06
卷号	109 期号:A2 页码:A02105
关键词	radio emissions magnetic reconnection energetic particles flares coronal mass ejections
ISSN号	0148-0227
英文摘要	[1] A typical flare - coronal mass ejection (CME) event is studied at the initial time and position of the flare and CME. The photospheric magnetic configuration consists of two main polarities ( dipolar structure) with some emerged new polarities, similar to a quadrupolar structure, during the event. The coronal loops in soft X-ray and EUV images show the signature of the loop interaction, i.e., the storage of the magnetic energy. The radio bursts at 1 - 2 GHz were observed with fast frequency drifts with bidirectional drift pairs, which may provide a direct signature of upward and downward particle acceleration from the reconnection site, followed by the bulk energy release of the flare. After that, the soft X-ray and EUV loops were suddenly opened and closed again in 10 min. The open time is around the maximum phase of the flare as well as the start time of the associated CME. Meanwhile, the polarization sense of the microwave bursts suddenly reversed at 2.6 - 3.8 GHz, which might have been caused by the fast variation of coronal loops or the magnetic field. The high-time-resolution ( 8 ms) data show the microwave bursts at 2.6 - 3.8 GHz, with slow frequency drifts and zebra structures in the initial phase of the CMEs or shock formation. Hence it is suggested that flares and CMEs may be triggered simultaneously by some MHD instabilities or by reconnection in a favorable magnetic configuration to release the free magnetic energy in two different ways.
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]	MAGNETIC RECONNECTION ; ACCELERATION ; EMISSION ; WAVES
收录类别	SCI
语种	英语
WOS记录号	WOS:000189047600001
公开日期	2012-12-22
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/7736]
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	Chinese Acad Sci, Purple Mt Observ, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Huang, GL. Radio and multiwavelength evidence of coronal loop eruption in a flare-coronal mass ejection event on 15 April 1998[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2004,109(A2):A02105.
APA	Huang, GL.(2004).Radio and multiwavelength evidence of coronal loop eruption in a flare-coronal mass ejection event on 15 April 1998.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,109(A2),A02105.
MLA	Huang, GL."Radio and multiwavelength evidence of coronal loop eruption in a flare-coronal mass ejection event on 15 April 1998".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 109.A2(2004):A02105.