Statistical Study of Magnetic Topology for Eruptive and Confined Solar Flares

Yanmei Cui, Haimin Wang, Yan Xu, Siqing Liu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1704-1714
Number of pages11
JournalJournal of Geophysical Research: Space Physics
Volume123
Issue number3
DOIs
StatePublished - Mar 2018

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Keywords

  • Confined flares
  • Eruptive flares
  • Magnetic topology

Fingerprint

Dive into the research topics of 'Statistical Study of Magnetic Topology for Eruptive and Confined Solar Flares'. Together they form a unique fingerprint.

Cite this