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      https://www.ias.ac.in/article/fulltext/joaa/018/01/0039-0055

    • Keywords

       

      Super-active region; chromosphere; flare activity; magnetic field

    • Abstract

       

      Super-active region NOAA 6555 was highly flare productive during the period March 21st–27th, 1991 of its disk passage. We have st udied its chromospheric activity using high spatial resolution Hα filtergrams taken at Udaipur along with MSFC vector magnetograms. A possible relationship of flare productivity and the variation in shear has been explored. Flares were generally seen in those subareas of the active region which possessed closed magnetic field configuration, whereas only minor flares and/or surges occurred in subareas showing open magnetic field configuration. Physical mechanisms responsible for the observed surges are also discussed.

    • Author Affiliations

       

      C. Debi Prasad1 Ashok Ambastha1 Nandita Srivastava1 Sushanta C. Tripathy1 Mona J. Hagyard2

      1. Udaipur Solar Observatory (Physical Research Laboratory), Udaipur - 313 001, India
      2. ES52, Space Science Laboratory, NASA/Marshall Space Flight Center, Huntsville, AL - 35812, USA
    • Dates

       
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