Gao Yu
Source Publicationresearchinastronomyandastrophysics
AbstractAn alternative parameter RJz is introduced as the ratio of one of two kinds of opposite-sign current to the total current and is used to investigate the relationship between this quantity and the hemispheric helicity sign rule(HSR) that has been established by a series of previous statistical studies. The classification of current in each hemisphere obeys the following rule: if the product of the current and the corresponding longitudinal field component contributes a consistent sign with respect to the HSR,it is called "HSR-compliant" current,otherwise it is called "HSR-noncompliant" current. Firstly,consistency between the butterfly diagram of RJz and current helicity was obtained in a statistical study.Active regions with RJzsmaller than 0.5 tend to obey the HSR whereas those with RJz greater than 0.5 tend to disobey it. The "HSR-compliant" current systems have a 60% probability of realization compared to 40% for "HSR-noncompliant" current systems. Overall,the HSR is violated for active regions in which the "HSR-noncompliant" current is greater than the "HSR-compliant" current. Secondly,the parameter RJz was subsequently used to study the evolution of current systems in the case analyses of flare-productive active regions NOAA AR 11158 and AR 11283. It is found that there is a "RJz-quasistationary" phase that is relatively flare quiescent and "RJz-dynamic" phase that is characterized by the occurrence of large flares.
Document Type期刊论文
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Gao Yu. aquantitycharacterizingvariationofobservedmagnetictwistinsolaractiveregions[J]. researchinastronomyandastrophysics,2018,018(003):28.
APA Gao Yu.(2018).aquantitycharacterizingvariationofobservedmagnetictwistinsolaractiveregions.researchinastronomyandastrophysics,018(003),28.
MLA Gao Yu."aquantitycharacterizingvariationofobservedmagnetictwistinsolaractiveregions".researchinastronomyandastrophysics 018.003(2018):28.
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