Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...116..217s&link_type=abstract
Astronomy and Astrophysics, vol. 116, no. 2, Dec. 1982, p. 217-223.
Astronomy and Astrophysics
Astrophysics
32
Cosmic Plasma, Dense Plasmas, Plasma Radiation, Solar Corona, Type 4 Bursts, Coronagraphs, Coronal Loops, Electron Density (Concentration), Isophotes, Light (Visible Radiation)
Scientific paper
A coronal transient rising above the eastern limb of the sun was observed simultaneously on April 27, 1980 by the Coronagraph/Polarimeter (C/P) aboard the Solar Maximum Mission spacecraft and by the Culgoora radioheliograph (CRH). The C/P observed an outward-moving loop transient followed by a plasmoid of dense ionized material, while the CRH observed several types of radio bursts, including a moving Type IV burst at 80 MHz whose position coincided with the bright plasmoid. An estimate of the reasonable lower limit of the electron density in the moving Type IV burst indicates that this burst could have resulted from emission at either the fundamental or the second harmonic of the plasma frequency. This is a new result because in the past it was thought that the density in the moving Type IV source region would be too low for plasma radiation.
Dulk George A.
House Leanna L.
Illing R.
Sawyer Constance
Sheridan K. V.
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