Wave Reflections in the Solar Atmosphere
Abstract
The small phase-lag between velocities observed at different chromospheric levels is interpreted as being due to acoustic waves reflected by the very hot atmospheric layers of the chromosphere-corona transition zone. We consider first an isothermal slab, then a realistic solar atmospheric model and calculate weighting functions for velocities in Ca II lines. It is shown that taking into account these functions and integrating over horizontal wave numbers leads to a good agreement with previous observations (Mein, 1977) in the case of 8498 and 8542 Ca II lines. For the K line, the less good agreement shows that magnetoacoustic waves become important in the upper chromospheric layers.
- Publication:
-
Solar Physics
- Pub Date:
- November 1979
- DOI:
- 10.1007/BF00151114
- Bibcode:
- 1979SoPh...64...43P
- Keywords:
-
- Acoustic Propagation;
- Atmospheric Models;
- Chromosphere;
- Solar Atmosphere;
- Solar Corona;
- Wave Reflection;
- Atmospheric Stratification;
- Magnetoacoustic Waves;
- Stellar Models;
- Weighting Functions;
- Solar Physics;
- Atmosphere;
- Reflection;
- Weighting Function;
- Transition Zone;
- Acoustic Wave