White light and radio studies of the coronal transient of 14 15 September 1973

Details White light and radio studies of the coronal transient of 14 15 September 1973 White light and radio studies of the coronal transient of 14 15 September 1973

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49..369s&link_type=abstract

Solar Physics, Volume 49, Issue 2, pp.369-394

Physics

4

Scientific paper

Observations of a coronal transient event were obtained in white light by the Skylab coronagraph and at metric wavelengths by the radioheliograph and spectrograph at Culgoora and the spectrograph-interferometer at Boulder. The continuum radio burst was found to originate above the outward-moving white light loop - a region of compressed material headed by a bow wave. The computed density in the region of radio emission, based on either gyro-synchrotron or harmonic plasma radiation mechanisms, was approximately 10 times the ambient coronal density; this is compatible with the density deduced from the white light observations. The magnetic energy density derived from the radio observations was greater than 10 times the thermal energy density, marginally larger than the kinetic energy density in the fastest moving portion of the transient, and considerably larger in most other regions. The ambient medium, the white light front, the compression region, the loop, and the slower, massive flow of material behind are each examined. It is found that the plasma was magnetically controlled throughout, and that magnetic forces provided the principal mechanism for acceleration of the transient material from the Sun.

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