Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...58..363m&link_type=abstract
Solar Physics, vol. 58, July 1978, p. 363-387.
Physics
56
Calcium, Far Ultraviolet Radiation, Photosphere, Radiant Heating, Solar Flares, Solar Temperature, Atmospheric Heating, Energy Spectra, K Lines, Line Shape, Metal Ions, Solar Atmosphere, Solar Heating, Solar Physics, Ultraviolet Spectra
Scientific paper
The paper analyzes Ca II K-line profiles of one flare and EUV continuum observations of two other flares in an effort to obtain values for temperature enhancements over active region values produced in the upper photosphere around and above the temperature minimum region. Results show that the flare temperature minimum is depressed some two scale heights below its preflare level and that substantial temperature enhancements are produced even at this depth. Consideration is also given to possible heating mechanisms which might be responsible for the observed enhancements, including (1) heating by EUV radiation, (2) heating by proton beams with low dispersion energy spectra centered at 10-20 MeV, and (3) localized heating at temperature minimum levels.
Brown John C.
Emslie Gordon A.
Machado Marcos E.
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