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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/014/01/0045-0052

    • Keywords

       

      Spectroheliograms; spotless flare; Hα filament; plages

    • Abstract

       

      We have taken the case of a circular Hα filament observed on May 9,1979 erupting into a double-ribbon flare associated with a non-spot region. The plage motions are responsible for the filament reorientation and, here as a special case, wherein the filament attains a clear circular shape before the onset of a flare. We conclude that the change in the orientation of the Hα filament marks the instability giving rise to the flare.

    • Author Affiliations

       

      K. Sundara Raman1 S. S. Gupta1 R. Selvendran1

      1. Indian institute of Astrophysics, Kodaikanal - 624103

    • Dates

       
      Published
      March 1993
      Manuscript received
      5 November 1992
      Accepted
      15 February 1993

  • 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

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