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Impulsive H-alpha diagnostics of electron-beam-heated solar flare model chromospheres

Journal Article · · Astrophys. J.; (United States)
DOI:https://doi.org/10.1086/165795· OSTI ID:5477295
;
Time-dependent H-alpha profiles were computed for the dynamic model atmospheres of Fisher, Canfield, and McClymont (1985) simulating the effects of an intense impulsively initiated power-law beam of electrons incident on the chromosphere. The temporal response of H-alpha arises from three separate physical mechanisms, whose relative importance varies over the line profile. The fastest variations (typically less than 0.1 s for the explosive heating discussed here) arise from energy imbalance; these are apparent on chromospheric heating and cooling time scales and have their greatest amplitude at line center. Slower variations arise from ionization imbalance and are most apparent in the blue wing. The slowest variations arise from hydrodynamic effects and are related to the formation of a chromospheric condensation; these are most apparent in the red wing. These results provide a basis for the design and analysis of observations of H-alpha, in coordination with hard X-rays or microwaves, to test mechanisms of energy transport in solar flares. 18 references.
Research Organization:
Hawaii Univ., Honolulu; California Univ., San Diego
OSTI ID:
5477295
Journal Information:
Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 322; ISSN ASJOA
Country of Publication:
United States
Language:
English

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Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BALMER LINES
CHROMOSPHERE
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
ENERGY SPECTRA
FERMIONS
HARD X RADIATION
IONIZING RADIATIONS
LEPTONS
MATHEMATICAL MODELS
PLASMA DIAGNOSTICS
RADIATIONS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR ELECTRONS
SOLAR FLARES
SOLAR PARTICLES
SOLAR RADIATION
SPECTRA
STAR MODELS
STELLAR RADIATION
TIME DEPENDENCE
VARIATIONS
X RADIATION