Source structure of gradual rise and fall bursts at 17 GHz

Details Source structure of gradual rise and fall bursts at 17 GHz Source structure of gradual rise and fall bursts at 17 GHz

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...78..243k&link_type=abstract

Solar Physics, vol. 78, June 1982, p. 243-252.

Physics

6

High Temperature Plasmas, Microwave Interferometers, Solar Flares, Solar Radio Bursts, Spatial Distribution, Circular Polarization, Coronal Loops, Magnetic Flux, Plasma Heating, Space Plasmas, Type 3 Bursts

Scientific paper

Gradual rise and fall (GRF) solar burst events are examined statistically to determine the location of high temperature plasmas in flare events. Observations of 195 GRF bursts recorded on a 17 GHz interferometer were employed, with all events lasting a minimum of 30 min and lacking rapid variations. The majority of GRF bursts displayed weak or undetectable circular polarization, while 21% of the events had a bipolar structure with a brightness maximum near the polarization reversal point. Separation distances are determined after producing east-west contours from observed Fourier components of the events using a Hamming data window, finding a 50-60 arcsec separation between the north and south polarity spots. FWHM calculations of the size of the source resulted in half the distance of the polarity spots and a source location near the top of the magnetic loops, where the plasma heating was concluded to occur.

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