Physics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..108..113k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 108, no. 1, 1987, p. 113-129.
Physics
11
Optical Data Processing, Radio Observation, Solar Corona, Solar Rotation, Spectroheliographs, Coronal Holes, Magnetic Signatures, Solar Limb
Scientific paper
Meterwave maps of the solar corona made with the Clark Lake Radioheliograph at 30.9, 50, and 73.8 MHz for one solar rotation are presented. They are compared and contrasted with optical data: 10,830 A maps, white-light coronagraph images (SOLWIND and Mauna Loa K coronameter), and forbidden line scans. Most of the sources in the radio maps persist for two days or more, and appear to rotate approximately with the solar rate. A coronal hole seen against the disk at all three frequencies shows interesting similarities and significant differences with the optical signatures of the hole. Elongated features of the 50 MHz corona correspond rather well to the azimuthal position of white light streamers seen in SOLWIND images. Synoptic charts made from the radio maps show overall similarities to synoptic charts constructed from (limb) coronagraph data. Some of the differences may result from the different weightings given by the radio and optical data to density and temperature, or by the different sensitivities to nonradial geometries. It is shown that the combined use of meter wave and optical images provides considerable new insights into the three-dimensional structure of the low to middle corona.
Gergely Tomas E.
Kundu Mukul R.
Loiacono R.
Schmahl Ed. J.
Szabo Andras
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