Solar Physics

, Volume 65, Issue 2, pp 357–368

Dynamics of flare sprays

  • E. Tandberg-Hanssen
  • Sara F. Martin
  • Richard T. Hansen
Article

Abstract

During solar cycle No. 20 new insight into the flare-spray phenomenon has been attained due to several innovations in solar optical-observing techniques (higher spatial resolution cinema-photography, tunable pass-band filters, multi-slit spectroscopy and extended angular field coronagraphs). From combined analysis of 13 well-observed sprays which occurred between 1969–1974 we conclude that (i) the spray material originates from a preexisting active region filament which undergoes increased absorption some tens of minutes prior to the abrupt chromospheric brightening at the ‘flare-start’, and (ii) the spray material is confined within a steadily expanding, loop-shaped (presumably magnetically controlled) envelope with part of the material draining back down along one or both legs of the loop.

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Copyright information

© D. Reidel Publishing Co. 1980

Authors and Affiliations

  • E. Tandberg-Hanssen
    • 1
  • Sara F. Martin
    • 2
  • Richard T. Hansen
    • 3
  1. 1.NASA/Marshall Space Flight CenterAla.U.S.A.
  2. 2.California State UniversityNorthridgeU.S.A.
  3. 3.High Altitude ObservatoryBoulderU.S.A.

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