Long-lived microwave pulsations observed in a complex solar active region

Details Long-lived microwave pulsations observed in a complex solar active region Long-lived microwave pulsations observed in a complex solar active region

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..804g&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Oct. 15, 1980, p. 804-810.

Astronomy and Astrophysics

Astrophysics

32

Faculae, Microwave Emission, Pulsed Radiation, Solar Activity, Solar Radio Emission, High Energy Electrons, Magnetic Flux, Solar Magnetic Field, Synchrotron Radiation

Scientific paper

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.

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