A purely coronal hard X-ray event.
Abstract
OSO 7 observations of a hard X-ray event of coronal origin are described. This event had a duration of more than 42 min as well as an abnormally large hard/soft ratio and apparently occurred after the disappearance of a bright coronal streamer. This gradual hard X-ray event is tentatively associated with open field lines extending well above the closed loop structures that participated in the originating flare. It is noted that a gradual hardening of the hard X-ray spectral distribution occurred during the event. Physical conditions in the source are considered, and the results are compared with observations of other hard X-ray events associated with flares.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1978
- DOI:
- 10.1086/156370
- Bibcode:
- 1978ApJ...224..235H
- Keywords:
-
- Solar Corona;
- Solar Flares;
- Solar X-Rays;
- Spaceborne Astronomy;
- X Ray Spectra;
- Bursts;
- Oso-7;
- Solar Electrons;
- Type 2 Bursts;
- Type 4 Bursts;
- Solar Physics;
- Solar Corona:X Rays;
- Solar Flares:X Rays