Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...152...42g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 152, no. 1, Nov. 1985, p. 42-50.
Astronomy and Astrophysics
Astrophysics
10
Harmonic Radiation, Plasma Radiation, Solar Corona, Type 4 Bursts, Brightness Temperature, Circular Polarization, Ionospheric Propagation, Refraction, Synchrotron Radiation
Scientific paper
The coronal transient event of 1980 June 29, 0233 UT, was well observed by the HAO Coronagraph/Polarimeter aboard SMM and at meter radio wavelengths by the Culgoora Radioheliograph. The radio event consisted of a strong Type II (shock wave related) burst followed by weak Type IV (storm) continuum. The authors discuss the details of the Type IV portion of the event in terms of two possible emission mechanisms-plasma emission (at the second harmonic) and gyro-synchrotron emission. They find that gyro-synchrotron emission is a possible mechanism only if more stringent requirements are met, viz., that the density of electrons of energy greater than 10 keV is about 10% of the ambient density, that the average energy is about 40 keV, and that the magnetic field strength at 2.5 solar radii is about 2.8 gauss. The authors conclude that this Type IV event is likely due to plasma emission at the 2nd harmonic of the plasma frequency.
Dulk George A.
Gary Dale E.
House Leanna L.
Illing R.
Wagner William J.
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