Radio and white-light observations of the 1973 August 21 coronal transient

Details Radio and white-light observations of the 1973 August 21 coronal transient Radio and white-light observations of the 1973 August 21 coronal transient

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..575g&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, June 1, 1979, p. 575-580.

Astronomy and Astrophysics

Astrophysics

15

Radio Observation, Solar Corona, Solar Radio Emission, Visual Observation, Electron Density (Concentration), Graphs (Charts), Radio Emission, Stellar Mass Ejection

Scientific paper

A coronal transient, which occurred on August 21, 1973, has been observed simultaneously in white light and at decameter radio wavelengths. The radio observations were obtained with a two-dimensional swept-frequency array (called the Teepee Tee). The white-light observations consist of a series of photographs taken by the High Altitude Observatory's coronagraph aboard Skylab. The radio emission associated with the transient was continuum in nature and lasted for almost 5 hours. The source of emission was observed to be cospatial with the lower part of one of the secondary white-light loops. A lower limit of 0.6 solar radius for the depth (extension along the line of sight) of this part of the transient was derived from considerations of radio-wave propagation in the corona. The radio source showed no dispersion of height with frequency, and, therefore, the emission is attributed to gyrosynchrotron radiation. Based on this assumption, the magnetic-field strength in the lower part of the loop is estimated to be in the 2.0-4.5-gauss range at a height of 2.1 solar radii from the center of the sun.

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