1. Home
    2. Journals
    3. Journal of Astrophysics and Astronomy
    4. Volume 18
    5. Issue 1

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      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

       
      Published
      June 1997
      Manuscript received
      9 May 1996
      Accepted
      10 June 1996

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2022-2023 Indian Academy of Sciences, Bengaluru.

Contact | Site index