Source regions for type II radio bursts

Details Source regions for type II radio bursts Source regions for type II radio bursts

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...42..445d&link_type=abstract

Solar Physics, vol. 42, June 1975, p. 445-459.

Physics

12

Frequency Distribution, Solar Flares, Type 2 Bursts, Faculae, Northern Hemisphere, Solar Cycles, Southern Hemisphere, Spectroheliographs, Time Lag

Scientific paper

Flares associated with reported type II bursts from 1964-1973 (hereafter abbreviated source-flares) are analyzed with respect to their importance, duration, and heliographic distribution. The source-flares are generally normal to small in area and normal to brilliant in intensity; however, they have slightly longer durations than would be expected from flares with such small areas. Flares associated with type II bursts are distributed uniformly east and west of the central meridian. This implies that type II bursts cannot be narrow-beamed, radially-propagating radio emitters. The heliographic distribution of source-flares shows large-scale organization into similarly shaped regions (source-regions) separated by 180 degrees of longitude in each polar hemisphere. The shape of the source-regions differs between the northern and the southern hemispheres. The source-regions exhibit growth and motion characteristics which suggest that their development is due partly to the effects of differential rotation.

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