Microwave characteristics of a behind-the-limb proton flare

Details Microwave characteristics of a behind-the-limb proton flare Microwave characteristics of a behind-the-limb proton flare

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..134..171k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 134, July 1991, p. 171-186.

Physics

3

Microwave Emission, Solar Flares, Solar Limb, Solar Protons, Solar Corona, Solar Radio Bursts, Solar X-Rays

Scientific paper

Behind-the-limb flares provide a unique opportunity for the study of vertical source structure of microwave bursts and dynamic flare processes. Based on complex observational data related to the outstanding solar proton event on February 16, 1984, the development of burst emission at a height z above 200,000 km over the photosphere has been investigated. A comparison with the associated X-ray emission measured aboard various spacecraft yields a time lag of under 1 min between the onset of the unocculted impulsive HXR-emission and the onsets of the X-ray and microwave emissions occulted by the solar limb. The lag corresponds to a range of speeds of the propagation of the flare volume of about 3000-5000 km/s. A qualitative model of shock-wave activation of loops successively reaching into larger coronal heights is proposed.

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