Long-lived microwave pulsations observed in a complex solar active region
Abstract
Microwave pulsations were detected on Sept. 13, 1977 in the intense emission from a compact microwave source associated with the large, slowly rotating, and magnetically complex solar active region, McMath 14943. These pulsations persisted over 5-1/2 hours, with the dominant repetition rate remaining close to 0.4 Hz; they were not associated with flare activity. The core of the microwave emission was located over a plage rather than over the major spot in the region. A mechanism for the pulsating source is proposed in which radial oscillations in an arched magnetic flux tube modulate the gyrosynchrotron emission from high energy electrons trapped in the tube.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- October 1980
- DOI:
- 10.1086/158391
- Bibcode:
- 1980ApJ...241..804G
- Keywords:
-
- Faculae;
- Microwave Emission;
- Pulsed Radiation;
- Solar Activity;
- Solar Radio Emission;
- High Energy Electrons;
- Magnetic Flux;
- Solar Magnetic Field;
- Synchrotron Radiation;
- Solar Physics