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Energetics and dynamics in a large solar flare of 1989 MarchSolar Maximum Mission X-ray observations and National Solar Observatory/Sacramento Peak H alpha spectra are combined in a large (X1.2) solar flare to test predictions of chromospheric heating and evaporation by nonthermal thick-target electrons. It is demonstrated that the ratio of H alpha flare energy flux to the energy flux deposited by thick-target electrons obeys a power-law dependence on electron heating flux, with a slope that is consistent with that predicted by a thick-target electron transport and heating model in a 1D hydrostatic atmosphere. It is concluded that the thick-target model satisfactorily accounts for the observed magnitude of chromospheric H alpha emission, and the amplitudes and timing of oppositely directed plasma motions during the impulsive phase of this X flare.
Document ID
19920036709
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Wulser, Jean-Pierre
(Hawaii Univ. Honolulu, HI, United States)
Canfield, Richard C.
(Hawaii, University Honolulu, United States)
Zarro, Dominic M.
(Applied Research Corp. Landover, MD; Lockheed Research Laboratories, Palo Alto, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 384
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
92A19333
Funding Number(s)
CONTRACT_GRANT: NAS5-30431
CONTRACT_GRANT: NSF AST-89-00716
CONTRACT_GRANT: NAG5-744
Distribution Limits
Public
Copyright
Other

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