Hydrodynamic simulations of flare/surge events

Details Hydrodynamic simulations of flare/surge events Hydrodynamic simulations of flare/surge events

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63..187s&link_type=abstract

Solar Physics, vol. 63, Aug. 1979, p. 187-200.

Physics

24

Chromosphere, Mathematical Models, Solar Corona, Solar Flares, Stellar Mass Ejection, Surges, Computerized Simulation, Density Distribution, Hydrodynamic Equations, Magnetohydrodynamics, One Dimensional Flow, Temperature Profiles, Time Dependence, Velocity Distribution

Scientific paper

A one-dimensional, hydrodynamic, time-dependent model which simulates the major observed dynamics of flare associated surges was developed. The thermodynamics, the surge mass, the time scales, the physical dimensions, and the velocities of typical surge events are reproduced. The surge is created by a sudden pressure increase at the top of the chromosphere, and this pressure pulse produces a disturbance which is followed, with a time-dependent numerical solution, as it propagates upward through the transition region and into the corona. The leading edge of the disturbance is a weak shock which has only a slight effect on the original transition region and coronal thermodynamics. The major effect occurs behind the shock where the temperature is decreased and the density is increased, and this cool, dense region moves upward then falls downward. After the material begins returning to the chromosphere, a second shock is formed which propagates upward, brings the infalling material to rest, and returns the atmosphere to hydrostatic equilibrium.

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