Flares of radio type II and coronal emission in the course of cycle No. 20

Details Flares of radio type II and coronal emission in the course of cycle No. 20 Flares of radio type II and coronal emission in the course of cycle No. 20

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..133..399k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 133, June 1991, p. 399-402.

Physics

Solar Corona, Solar Flares, Type 2 Bursts, Radio Emission, Shock Waves, Solar Radio Bursts

Scientific paper

A heliographic latitude vs time 'butterfly' diagram has been constructed for coronal emissions in the Fe XIV 530.3 nm line over the course of the 1965-1976 cycle 20. It is noted that the occurrence of flares with a type II burst in regions up to isophote 30 is very rare, then becomes small between isophotes 30 and 50, and between 50 and 70 increases to significant values. The type II radio bursts, in terms of semiannual values over the entirety of cycle 20, reach a maximum in 1970, then exhibit an anomalous decrease in 1971; this phenomenon is also seen in coronal emission, and disagrees with sunspot number, but is in agreement with total flare occurrence.

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