Vector magnetic field changes associated with X-class flares

Haimin Wang, M. W. Ewell, H. Zirin, Guoxiang Ai

Research output: Contribution to journalArticlepeer-review

203 Scopus citations


We present high-resolution transverse and longitudinal magnetic field measurements bracketing five X-class solar flares. We show that the magnetic shear, defined as the angular difference between the measured field and calculated potential field, actually increases after all of these flares. In each case, the shear is shown to increase along a substantial portion of the magnetic neutral line. For two of the cases, we have excellent time resolution, on the order of several minutes, and we demonstrate that the shear increase is impulsive. We briefly discuss the theoretical implications of our results.

Original languageEnglish (US)
Pages (from-to)436-443
Number of pages8
JournalAstrophysical Journal
Issue number1
StatePublished - Mar 20 1994

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Sun: flares
  • Sun: magnetic fields


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