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    • 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

  • Journal of Astrophysics and Astronomy | News

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