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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); LI, KJ
发表期刊ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
1995-02
卷号109期号:2页码:347-353
产权排序第1完成单位
收录类别SCI
关键词Sun Activity Sun Flare Filament
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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0365-0138
URL查看原文
WOS记录号WOS:A1995QD93000010
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]RADIO-BURSTS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6016
专题太阳物理研究组
通讯作者LI, KJ
推荐引用方式
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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,&LI, KJ.(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.
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