Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..135...65h&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 135, Sept. 1991, p. 65-88.
Physics
23
Chromosphere, Electron Beams, H Alpha Line, Hydrogen Plasma, Pulse Heating, Solar Flares, Digital Simulation, Line Shape, Local Thermodynamic Equilibrium, Time Dependence
Scientific paper
Starting from the new flare models of Karlicky (1990) and Karlicky and Henoux (1991), the first time-dependent numerical simulations of hydrogen plasma excitation and ionization on time scales of less than one second are presented. These time scales are consistent with the spiky behavior of the kinetic temperature produced by nonthermal collisional processes. Such temperature spikes represent a chromospheric response to a series of short-duration electron beam pulses which are supposed to heat the flare atmosphere. A self-consistent numerical solution of a simplified, time-dependent, non-LTE problem for a three-level hydrogen atom model with continuum makes it possible to predict theoretically a qualitative behavior of the H-alpha line intensity variations on very short time intervals. The present H-alpha temporal profiles, evaluated at the line center and for Delta-lambda of 1 A, can be qualitatively compared with some recent flare observations obtained with high temporal resolution.
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