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Analysis of a delta spot
Liu, Y; Zhang, HQ
2002-05-01
发表期刊ASTRONOMY & ASTROPHYSICS
卷号386期号:2页码:646-652
摘要delta-groups generally develop in three different ways: eruption of a single complex active region, eruption of large satellite spots near a large older spot, or collision of spots of opposite polarity from different dipoles. In this paper, we present a rare observational result in which a delta-spot forms from rapid coalescence of two opposite magnetic features in a pre-existing delta-configuration. The white-light (WL) observations of this delta-spot in active region NOAA 9077 were performed by TRACE. The time-lapse movie of the co-aligned WL images shows that the whole active region was undergoing rapid disintegration and reconstruction on 11{17 July 2000. The preceding (p) and following (f) components of the delta-spot continue to grow in size, while the active region is in the decaying phase. Their proper motions are determined as a function of time using SOHO/MDI full-disk magnetograms. A major are (3B/X5.7) erupted in the active region on 14 July. Initially, a relative shearing motion is visible between the p and f spots on this day. About two hours before the major are, the shearing motion suddenly stops and the velocities change significantly. The ribbons of the are are located just outside of the delta-configuration. An interesting finding is the sign reversal of the helicity of the f spot also just 2 hours before the are. The delta-spot obviously separates after the are. Our results clearly demonstrate that helicity reversal in magnetic features of a delta-configuration is likely to destabilize the compact structure, as well as to re-organize the magnetic field configuration, and, hence, is important for the rapid disintegration of a delta-spot during major flares. A model is presented to explain why a spot can change its chirality.
关键词Sun : Magnetic Fields Sun : Sunspots Sun : Flares
DOI10.1051/0004-6361:20020257
收录类别SCI
语种英语
WOS记录号WOS:000175132400024
引用统计
被引频次:17[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8634
专题太阳物理研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Liu, Y,Zhang, HQ. Analysis of a delta spot[J]. ASTRONOMY & ASTROPHYSICS,2002,386(2):646-652.
APA Liu, Y,&Zhang, HQ.(2002).Analysis of a delta spot.ASTRONOMY & ASTROPHYSICS,386(2),646-652.
MLA Liu, Y,et al."Analysis of a delta spot".ASTRONOMY & ASTROPHYSICS 386.2(2002):646-652.
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