Semiempirical model of the upper flare chromosphere

Journal Article · Thu Mar 01 04:00:00 EST 1979 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/156884· OSTI ID:6080788

Lites, B W; Cook, J W

Ultraviolet spectra of the 1973 August 9 flare taken with the NRL S082B spectrograph aboard ATMSkylab have been analyzed to derive a seiempirical model of the flare chromosphere between 5500 and 10/sup 5/ K. The hydrogen radiative transfer is solved to obtain a self-consistent set of physical conditions within the flare atmosphere, from which lines profiles and continua of the ions C I, C II, C III, and C IV are synthesized and compared to the observations. The model exhibits a rapid rise in the temperature at a column mass of 3 x 10/sup -4/ g cm/sup -2/. There is some evidence for much of the C III line emission arising from flare kernels not exceeding 3'' in size, and the C IV line profiles indicate the possibility of nonequilibrium excitation.

• Research Organization: Laboratory for Atmospheric and Space Physics, University of Colorado at Boulder
• OSTI ID: 6080788
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 228:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
CARBON
CHROMOSPHERE
ELEMENTS
ENERGY-LEVEL TRANSITIONS
LINE BROADENING
LINE WIDTHS
LYMAN LINES
MATHEMATICAL MODELS
NONMETALS
RADIATION TRANSPORT
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR FLARES
SPECTRA
STAR MODELS
ULTRAVIOLET SPECTRA