Hot downflows above supergranular boundaries
Abstract
In recent years, several UV observations have detected, above supergranular boundaries, hot downflows, which have been interpreted as cool spicular matter falling back after being heated to coronal temperatures. An examination of possible heating mechanisms leads us to discard the process of conductive or radiative heating from the hot corona. An alternative process which involves the compressive heating of the cool spicular material is proposed and shown to be able to reproduce the required temperature rise over the correct time scale.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1980
- DOI:
- 10.1086/183325
- Bibcode:
- 1980ApJ...240L..69P
- Keywords:
-
- Solar Atmosphere;
- Solar Granulation;
- Solar Oscillations;
- Ultraviolet Astronomy;
- Solar Corona;
- Solar Radiation;
- Solar Spectra;
- Spicules;
- Vertical Motion;
- Astrophysics