Quiet sun and slowly varying component at meter and decameter wavelengths

Details Quiet sun and slowly varying component at meter and decameter wavelengths Quiet sun and slowly varying component at meter and decameter wavelengths

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..112..325l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 112, no. 2, 1987, p. 325-340. Research supported by the Greek General Secretariat for Resea

Physics

32

Decametric Waves, Periodic Variations, Solar Activity, Solar Radio Emission, Stellar Spectrophotometry, Visible Spectrum, Astronomical Maps, Coronal Holes, Electron Density (Concentration), Spectrum Analysis

Scientific paper

Comparison of maps of the sun obtained over the period June 29 to July 8, 1982 at 169 MHz with the Nancay Radioheliograph and at 73.8, 50, and 30.9 MHz with the Clark Lake Radioheliograph shows that the slowly varying component at meter and decameter wavelengths is not always thermal emission. During the period under study weak noise storm continua were the most frequent sources of slowly varying component at 169 and 73.8 MHz. Most filaments show no counterpart on the disk. A streamer has been detected on the disk from 169 to 30.9 MHz with an optimum observability at 50 MHz. The brightest source of the slowly varying component from 73.8 to 30.9 MHz for most of the period was located above an extended coronal hole in a region where a depression was observed at 169 MHz. In favorable cases, electron densities can be derived from the positions of noise storms and radio streamers; these are in agreement with previous K-corona eclipse observations.

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