Solar Physics

, Volume 65, Issue 2, pp 357–368

Dynamics of flare sprays


  • E. Tandberg-Hanssen
    • NASA/Marshall Space Flight Center
  • Sara F. Martin
    • California State University
  • Richard T. Hansen
    • High Altitude Observatory

DOI: 10.1007/BF00152799

Cite this article as:
Tandberg-Hanssen, E., Martin, S.F. & Hansen, R.T. Sol Phys (1980) 65: 357. doi:10.1007/BF00152799


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.

Copyright information

© D. Reidel Publishing Co. 1980