White light and radio studies of the coronal transient of 14–15 September 1973 |
| |
| Authors: | S F Smerd G A Dulk R M MacQueen J T Gosling A Magun R T Stewart K V Sheridan R D Robinson S Jacques |
| |
| Institution: | (1) Department of Astro-Geophysics, University of Colorado, Boulder, Colorado, U.S.A.;(2) Division of Radiophysics, CSIRO, Sydney, Australia;(3) High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado, U.S.A.;(4) Division of Radiophysics, CSIRO, Sydney, Australia;(5) Department of Astro-Geophysics, University of Colorado, Boulder, Colorado, U.S.A. |
| |
| Abstract: | 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.Also, High Altitude Observatory, National Center for Atmospheric Research, Boulder, Colorado.Now at Los Alamos Scientific Laboratory, Los Alamos, New Mexico.The National Center for Atmospheric Research is sponsored by the National Science Foundation.On leave from Institute of Applied Physics, University of Berne, Switzerland.Also, Division of Radiophysics, CSIRO, Sydney, Australia. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
