Computer Science – Sound
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........5f&link_type=abstract
Ph.D. Thesis California Univ., San Diego.
Computer Science
Sound
2
Electrons, Energetic Particles, Hydrodynamics, Radiative Heat Transfer, Solar Atmosphere, Solar Flares, Space Plasmas, Stellar Models, Chromosphere, Extreme Ultraviolet Radiation, Sun, Wave Propagation
Scientific paper
The hydrodynamic and radiative responses of a preflare solar loop atmosphere to a short burst of energy in the form of energetic nonthermal electrons were modeled. Energy fluxes in the calculations range over values are suggested by observations. The major conclusions are: (1) There is an energy flux threshold for explosive evaporation. Explosive evaporation occurs when the upper chromosphere is unable to radiate the flare energy deposited there, and is therefore heated rapidly to coronal temperatures; (2) The expansion velocity of explosively evaporated plasma cannot exceed about 2.35 cs where cs is the sound speed in the evaporated material; (3) A simple analytic gasbag model for the temporal variation of velocity in the explosively evaporated plasma successfully reproduces the numerical results; and (4) The lower transition region, in both gentle and explosive evaporation, quickly reaches a quasisteady balance between conduction and radiation.
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