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Dynamics of flare sprays

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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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Authors and Affiliations

  1. NASA/Marshall Space Flight Center, Ala., U.S.A.

    E. Tandberg-Hanssen

  2. California State University, Northridge, Calif., U.S.A.

    Sara F. Martin

  3. High Altitude Observatory, Boulder, Colo., U.S.A.

    Richard T. Hansen

Authors
  1. E. Tandberg-Hanssen
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  2. Sara F. Martin
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  3. Richard T. Hansen
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Tandberg-Hanssen, E., Martin, S.F. & Hansen, R.T. Dynamics of flare sprays. Sol Phys 65, 357–368 (1980). https://doi.org/10.1007/BF00152799

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  • DOI: https://doi.org/10.1007/BF00152799

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