Impulsive variations of the magnetic helicity change rate associated with eruptive flares

Y. J. Moon, Jongchul Chae, Haimin Wang, G. S. Choe, Y. D. Park

Research output: Contribution to journalArticlepeer-review

66 Scopus citations

Abstract

In this paper, we investigate impulsive variations of the magnetic helicity change rate associated with eruptive solar flares (three X class flares and one M class flare) accompanying halo coronal mass ejections. By analyzing four sets of 1 minute cadence full-disk magnetograms taken by the Michelson Doppler Imager on board the Solar and Heliospheric Observatory, we have determined the rates of magnetic helicity transport due to horizontal photospheric motions. We have found that magnetic helicity of the order of 1041 Mx2 was impulsively injected into the corona around the flaring peak time of all the flares. We also found that there is a positive correlation between the impulsively injected magnetic helicity and the X-ray peak flux of the associated flare. The impulsive helicity variations are attributed to horizontal velocity kernels localized near the polarity inversion lines. Finally, we report that there is a close spatial proximity between the horizontal velocity kernels and Hα bright points.

Original languageEnglish (US)
Pages (from-to)528-537
Number of pages10
JournalAstrophysical Journal
Volume580
Issue number1 I
DOIs
StatePublished - Nov 20 2002

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: activity
  • Sun: coronal mass ejections (CMEs)
  • Sun: flares
  • Sun: magnetic fields
  • Sun: photosphere

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