The sunspotless flare on April 12, 1991 and the evolution of the neighboring filaments

	The sunspotless flare on April 12, 1991 and the evolution of the neighboring filaments
	Li KJ(李可军); Zhong SH(钟树华); Ding YJ(丁有济); Bai JM(白金明); Li QY(李琼英)
刊名	ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
	1995-02
卷号	109 期号:2 页码:347-353
关键词	SUN SUN ACTIVITY FLARE FILAMENT
ISSN号	0365-0138
通讯作者	LI, KJ
产权排序	第一完成单位
英文摘要	On April 12, 1991, a 2N sunspotless flare was observed by using the spectra-spectroheliograph at Yunnan Observatory. H-alpha filtergrams and sequence H-alpha and H-gamma spectra were obtained. In this paper, the morphology of the sunspotless flare and the evolution of the nearby filaments are studied. The results show that the arch-shaped filament which appears on the neutral line to separate the active region from the solar quiet region is activated several days before the onset of the sunspotless flare, and disappears several hours before the onset. It is suggested that the sunspotless flare is associated with the filament, i.e. its activation, disparition brusque and so forth. The sunspotless flare is of unusual long duration (about 80 min in the H-alpha emission) and exhibits a slow rise to maximum intensity (about 20 min in the H-alpha emission) i.e. a 'long duration effect' and a 'gradual rise-and-fall effect' in both the H-alpha emission and the soft X-ray radiation, and the flash phase is poorly defined or absent. The energy released by the sunspotless flare may come from the magnetic energy stored in the corresponding plage region. The velocity along the line-of-sight is small for the sunspotless flare (less than several kilometers per second), but rather large for the nearby corridor filament (about a hundred km s(-1)). The horizontal extension velocity of the sunspotless flare is not large. Compared with the general major H-alpha flare of the same importance, the sunspotless flare is relatively gentle.
学科主题	Astronomy & Astrophysics
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	RADIO-BURSTS
收录类别	SCI
原文出处	http://adsabs.harvard.edu/abs/1995A%26AS..109..347L
语种	英语
WOS记录号	WOS:A1995QD93000010
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/6016]
专题	云南天文台_太阳物理研究组
推荐引用方式 GB/T 7714	Li KJ,Zhong SH,Ding YJ,et al. The sunspotless flare on April 12, 1991 and the evolution of the neighboring filaments[J]. ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES,1995,109(2):347-353.
APA	李可军,钟树华,丁有济,白金明,&李琼英.(1995).The sunspotless flare on April 12, 1991 and the evolution of the neighboring filaments.ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES,109(2),347-353.
MLA	李可军,et al."The sunspotless flare on April 12, 1991 and the evolution of the neighboring filaments".ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES 109.2(1995):347-353.