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Statistical Study of Magnetic Topology for Eruptive and Confined Solar Flares
Author(s) -
Cui Yanmei,
Wang Haimin,
Xu Yan,
Liu Siqing
Publication year - 2018
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2017ja024710
Subject(s) - solar flare , topology (electrical circuits) , physics , nanoflares , astrophysics , coronal mass ejection , magnetic field , mathematics , solar wind , combinatorics , quantum mechanics
Large flares and halo coronal mass ejections (CMEs) can often cause strong space environment disturbances and sequently a series of space environment effects. The X‐class flares associated with halo CMEs are particular prone to these effects. In this paper, 58 X‐class flares were collected and studied with the source locations in 30° from the disk center, which were observed from 1996 to 2015. Among these events, 48 flares were associated with CMEs and defined as “eruptive” events. The other 10 flares without CMEs were defined as “confined” flares. By comparing the properties of flares and associated magnetic fields for the two sets of samples, we found the following: (1) magnetic free energy and overlying transverse fields play important roles in producing solar eruptions. Eruptive flares with high‐speed CMEs tend to occur in active regions with more free energy and larger decay index. (2) CME speeds are affected by magnetic free energy, which are described by parameters of the unsigned magnetic flux, the area of polarity inversion region, and the strength of transverse fields in the low altitude. These parameters have moderate positive correlations with CME speeds.