Ly-alpha and H-alpha emission by superthermal proton beams. [In solar flares]

Journal Article · Thu Aug 01 04:00:00 EDT 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163371· OSTI ID:5680916

Canfield, R C; Chang, C R

Simnett and Harrison (1984) have presented a model in which 100-1000 keV protons are an energy transfer agent linking coronal mass ejections and solar flares. Orrall and Zirker (1976) suggested that such protons, incident upon the chromosphere, would produce nonthermal Ly-alpha emission after charge exchange with ambient chromospheric hydrogen atoms. The present investigation is concerned with a study of the charge-exchange mechanism proposed by Orral and Zirker. The physical theory of the formation of nonthermal Ly-alpha (and H-alpha) emission is considered, taking into account photon emission, atomic transitions, atomic equilibrium, the dominant atomic processes, and the stopping of superthermal protons. Computational results presented by Orrall and Zirker are extended. 26 references.

• Research Organization: California Univ., La Jolla
• OSTI ID: 5680916
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 295; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
BALMER LINES
BEAMS
CHARGE EXCHANGE
CHROMOSPHERE
DOPPLER EFFECT
ENERGY SPECTRA
LYMAN LINES
MASS TRANSFER
NUCLEON BEAMS
PARTICLE BEAMS
PROTON BEAMS
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR CORONA
SOLAR FLARES
SPECTRA
STELLAR ATMOSPHERES
STELLAR CORONAE