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Observations of vector magnetic fields in flaring active regions

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Abstract

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.

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Authors and Affiliations

  1. Big Bear Solar Observatory, California Institute of Technology, 91125, Pasadena, CA, USA

    Jimin Chen, Haimin Wang & Harold Zirin

  2. Beijing Astronomical Observatory, Chinese Academy of Sciences, 100080, Beijing, China

    Guoxiang Ai

Authors
  1. Jimin Chen
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  2. Haimin Wang
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  3. Harold Zirin
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  4. Guoxiang Ai
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Visiting Associate from Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China.

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Chen, J., Wang, H., Zirin, H. et al. Observations of vector magnetic fields in flaring active regions. Sol Phys 154, 261–273 (1994). https://doi.org/10.1007/BF00681099

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  • DOI: https://doi.org/10.1007/BF00681099

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