On the outburst of flare activity of 26 November, 1973

Details On the outburst of flare activity of 26 November, 1973 On the outburst of flare activity of 26 November, 1973

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...71...49h&link_type=abstract

Solar Physics, vol. 71, May 1981, p. 49-53.

Physics

3

Coronal Loops, H Alpha Line, Solar Flares, Solar Radio Bursts, Extreme Ultraviolet Radiation, Magnetic Flux, Solar Activity Effects, Solar X-Rays

Scientific paper

The possible source of a strong 30 hour-long outburst of homologous flare activity, and an unusual growth and brightening of coronal loops in the active region McMath 12628, on the eastern solar hemisphere, on Nov. 1973, as seen from Skylab are analyzed. Prior to that date, not many flares and subflares in the region were associated with radio bursts. However, almost all flares after that date were accompanied by microwaves and type III bursts until the last flare of this kind appeared at 03:52 on the 27th. All the type III bursts were accompanied by type U-bursts, giving evidence for strong closed fields rooted in the site of the radio bursts. It is recorded that U-bursts stopped after 07:18 on Nov. 26, and a change noted is attributed to the occurrence of two two-ribbon flares at the site of the recurrent activity which could have destroyed the U-type favorable situation. A two-ribbon flare, according to Kopp and Pneuman (1976), opens the magnetic field-configuration, and it is therefore suggested that a newly emerging magnetic flux was the source of the complex solar situation. It is suggested that this kind of activity should be studied during the FBS-ALERT periods in 1980-81.

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