Fine structure in a metric type 4 burst: Multi-site spectrographic, polarimetric, and heliographic observations

Details Fine structure in a metric type 4 burst: Multi-site spectrographic, polarimetric, and heliographic observations Fine structure in a metric type 4 burst: Multi-site spectrographic, polarimetric, and heliographic observations

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..155..373c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 155, no. 2, p. 373-390

Physics

13

Electromagnetic Scattering, Fine Structure, Solar Flares, Type 4 Bursts, Wave-Particle Interactions, Brightness Distribution, Emission Spectra, Particle Acceleration, Polarimetry, Solar Corona, Spectroheliographs

Scientific paper

The spectral fine structure of solar radio continua is thought to reveal wave-particle and wave-wave interactions in magnetic traps in the solar corona. We present observations of spectra, polarization, and spatial characteristics of combined emission/extinction features ('zebra patterns') during a decimetric/metric type 4 event on 5 June, 1990. Very high modulation depths are observed. The size and location of the sources during emission and extinction are determined for the first time. Two remarkable features are found: (1) The sources of emission stripes have finite size, up to nearly 2 minutes; during extinction stripes the brightness is reduced across the whole extent of the unperturbed continuum, which is slightly larger than 2 minutes. (2) During emission stripes the sources drift over distances up to several x 104 km, with apparent velocities up to 105 km/s. The observed features are briefly discussed with respect to interpretations based on wave-particle interactions and on the scattering of electromagnetic waves.

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