Diagnostics of non-thermal processes in chromospheric flares
IV. Limb flare spectra for an atmosphere bombarded by an electron beam
Received 8 June 1999 / Accepted 30 May 2000
H, Ly, Ly, CaII K and 8542 Å line profiles have been computed for limb flares with height distributions of temperatures as given by the semi-empirical models F1 and F2, by including the non-thermal collisional excitation and ionization of hydrogen and of ionized calcium that results from electron bombardment. In agreement with observations, the computed profiles of the hydrogen lines are very broad, especially at the height where the source function reaches its maximum. Non-thermal effects are less pronounced for CaII lines.
Key words: line: profiles radiation mechanisms: non-thermal Sun: flares
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© European Southern Observatory (ESO) 2000
Online publication: August 17, 2000