Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..342a&link_type=abstract
Astrophysical Journal, Part 1, vol. 222, May 15, 1978, p. 342-356.
Astronomy and Astrophysics
Astrophysics
50
Centimeter Waves, Circular Polarization, Solar Flares, Solar Magnetic Field, Solar Radio Bursts, Brightness Temperature, H Alpha Line, Luminous Intensity, Solar Activity Effects, Superhigh Frequencies
Scientific paper
During May 1974 data were collected on nine 6-cm solar bursts originating in two active regions. One-dimensional fan-beam scans were obtained every 30 seconds in order to study burst structure and evolution. Maximum burst flux was in the 0.34-12.0 sfu range. At maximum intensity the estimated brightness temperatures were in the 10 to the 6th to 2 x 10 to the 7th K range. Angular sizes ranged from 7-23 arcsec. In most cases an expansion of the burst core after maximum intensity was observed along with a drift in the position of the burst core. Four bursts were associated important H-alpha flares, and in all cases burst maximum occurred before flare maximum. The bursts were circularly polarized in the extraordinary mode sense during maximum intensity. Since the polarization was the same over the extent of the burst source, it is suggested that if the burst is associated with loop sources, the emission is associated with one leg of the loop.
Alissandrakis Constantine E.
Kundu Mukul R.
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