A high energy solar flare burst complex and the physical properties of its source region

Details A high energy solar flare burst complex and the physical properties of its source region A high energy solar flare burst complex and the physical properties of its source region

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986cospar........d&link_type=abstract

Presented at 26th COSPAR

Computer Science

Bursts, Microwave Emission, Solar Flares, X Ray Spectra, Bremsstrahlung, Electron Density (Concentration), Faculae, Magnetic Fields, Magnetohydrodynamic Waves

Scientific paper

A solar flare microwave burst complex, which exhibited a major structure consisting of some 13 spikes of 60 ms FWHM each, observed 21 May 1984 at 90 GHz (3 mn) is discussed. It was associated with a simultaneous very hard X-ray burst complex. A possible explanation in which the individual spikes of both bursts were caused by the same electron population is developed: the X-ray bursts by their bremsstrahlung, and the microwave bursts by their gyro-synchrotron emission. This latter explanation is based on the assumption that the radio turnover frequency is less than 150 GHz. The emission sources were characterized by an electron density of about 10 to the 11th power/cu cm, a temperature of 5 x 10 to the 8th power K and magnetic field of about 1400 to 2000 G. They had a size of about 350 km; if the energy release is caused by reconnection the sources of primary instability could have been smaller and in the form of thin sheets with reconnection speed at a fraction of the Alfven velocity and burst-like energy injections of 10 to the 27th power erg during about 50 ms each. The energized plasma knots lost their injection energy by saturated convective flux (collisionless conduction) in about 30 ms.

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