Preflare heating of filaments
Abstract
Disappearances of preflare filaments have been observed on June 22, 1980 (S07,W13) (flare at 13.04 U.T.) and September 3, 1980 (flare at 7.52 U.T.). The analysis of MSDP data (MEUDON) leads to the followings conclusions : - Disappearances begin a few minutes before the Hα impulsive phase. - The filaments can be seen again after the flares. - Upwards motions occur in several points, without disturbing significantly preëxisting downflows.
Velocity maps suggest shears or velocity loops. The filament disappearance seems to be due to a heating mechanism beginning before the flare maximum.- Publication:
-
Advances in Space Research
- Pub Date:
- 1982
- DOI:
- 10.1016/0273-1177(82)90178-8
- Bibcode:
- 1982AdSpR...2k..53M
- Keywords:
-
- Plasma Heating;
- Solar Flares;
- Solar Prominences;
- H Alpha Line;
- Spectral Line Width;
- Velocity Distribution;
- Solar Physics