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Formation of solar delta active regions: Twist and writhe of magnetic ropes
Zhang, HQ
AbstractWe analyze the process of formation of delta configuration in some well-known super active regions based on photospheric vector magnetogram observations. It is found that the magnetic field in the initial developing stage of some delta active regions shows a potential-like configuration in the solar atmosphere, the magnetic shear develops mainly near the magnetic neutral line with magnetic islands of opposite polarities, and the large-scale photospheric twisted field forming gradually later. Some results are obtained: (1) The analysis of magnetic writhe of whole active regions cannot be limited in the strong field of sunspots, because the contribution of the fraction of decayed magnetic field is non-negligible. (2) The magnetic model of kink magnetic ropes, supposed to be generated in the subatmosphere, is not consistent with the evolution of large-scale twisted photospheric transverse magnetic field and not entirely consistent with the relationship with magnetic,shear in some delta active regions. (3) The proposition is that the large-scale delta active regions are formed from contribution by small-scale non-potential magnetic flux bundles generated in the subatmosphere.
KeywordSun : Activity Sun : Flares Sun : Magnetic Fields
Indexed BySCI
WOS IDWOS:000226863000007
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Zhang, HQ. Formation of solar delta active regions: Twist and writhe of magnetic ropes[J]. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,2004,4(6):563-577.
APA Zhang, HQ.(2004).Formation of solar delta active regions: Twist and writhe of magnetic ropes.CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS,4(6),563-577.
MLA Zhang, HQ."Formation of solar delta active regions: Twist and writhe of magnetic ropes".CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS 4.6(2004):563-577.
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