Spatially coherent oscillations in microwave bursts

Details Spatially coherent oscillations in microwave bursts Spatially coherent oscillations in microwave bursts

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...85..185k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 85, May 1983, p. 185-190.

Physics

8

Microwaves, Plasma Oscillations, Solar Radio Bursts, Magnetohydrodynamics, Solar Corona, Solar Electrons, Solar Magnetic Field

Scientific paper

Solar microwave burst observations (made with the WSRT) with high time and high spatial resolution show large-scale (greater than 8000 km) short-period (1.5 s) modulations of the source. It is argued that an interpretation in terms of Alfven oscillations in the microwave source is ruled out by this observation. Instead it must be the source of the fast electrons, which produce the microwaves, that is oscillating. The fluctuating acceleration region is identified with a volume where a sheared field is compressed against a flux tube by an unstable current. MHD oscillations in the overlying fluxtube are caused by the pushing force. The rapidly expanding current plays a major role in the flare theory of van Tend and Kuperus (1978).

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