Observations of vector magnetic fields in flaring active regions

Jimin Chen, Haimin Wang, Harold Zirin, Guoxiang Ai

Research output: Contribution to journalArticlepeer-review

51 Scopus citations


We present vector magnetograph data of 6 active regions, all of which produced major flares. Of the 20 M-class (or above) flares, 7 satisfy the flare conditions prescribed by Hagyard (high shear and strong transverse fields). Strong photospheric shear, however, is not necessarily a condition for a flare. We find an increase in the shear for two flares, a 6-deg shear increase along the neutral line after a X-2 flare and a 13-deg increase after a M-1.9 flare. For other flares, we did not detect substantial shear changes.

Original languageEnglish (US)
Pages (from-to)261-273
Number of pages13
JournalSolar Physics
Issue number2
StatePublished - Oct 1994

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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