Pulse-beam heating in flare loops.
Abstract
Using a 1D hydbrid code, the authors evaluate a response of the flare loop atmosphere to a series of very short electron beam pulses with subsecond duration. Loop dynamics and energy balance are treated by solving the standard set of hydrodynamic equations, while the beam deceleration in denser atmospheric layers is evaluated by using a particle simulation technique. Ionization of hydrogen below T ≈ 104K is obtained by solving simultaneously the time-dependent non-LTE problem for a three-level hydrogen atom with continuum. The resulting electron densities are then used to compute radiation losses at each time step. The authors discuss the behaviour of time-dependent heating, the ionization structure of the chromosphere, and the role of relaxation processes. A series of short-duration electron beam pulses represents schematically the non-stationary heating in the flare loops. However, the time-dependent radiation-hydrodynamical approach used in this paper can also be applied to study other processes taking place in coronal loops.
- Publication:
-
Coronal Streamers, Coronal Loops, and Coronal and Solar Wind Composition
- Pub Date:
- November 1992
- Bibcode:
- 1992ESASP.348..237H
- Keywords:
-
- Coronal Loops;
- Electron Beams;
- Hydrodynamic Equations;
- Solar Flares;
- Solar Radiation;
- Computer Programs;
- Energy Distribution;
- Heating;
- Mathematical Models;
- Time Dependence;
- Solar Physics