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Solar Physics

, Volume 65, Issue 2, pp 357–368 | Cite as

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.

Keywords

Spectroscopy Flare Active Region Solar Cycle High Spatial Resolution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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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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