Coronal X-ray holes and the quiet radio sun at 2800 MHz

Details Coronal X-ray holes and the quiet radio sun at 2800 MHz Coronal X-ray holes and the quiet radio sun at 2800 MHz

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...54..393c&link_type=abstract

Solar Physics, vol. 54, Oct. 1977, p. 393-402.

Physics

2

Microwave Emission, Radio Observation, Solar Corona, Solar Radio Emission, Solar X-Rays, Solar Activity, Solar Flux

Scientific paper

Radio-cool regions observed on strip scans of the sun made at 2800 MHz with a 1.5-arcmin fan beam are associated with X-ray coronal holes and are used to derive lower envelopes which are similar to spotless-sun drift curves. Fluxes are evaluated from a solar patrol; e.g., that of Coronal Hole 1 observed during the Skylab Mission, with central meridian passage on July 25, 1973, is 66.5 sfu (+ or - 0.6%). This level is identified as that observed during a sunspot minimum by comparison with the flux of 67.2 sfu observed in July 1964 and with the low daily values of 67.5 and 67.1 sfu observed in April 1975 and January 1976. An observed enhancement of the quiet-sun value by 3.0 sfu for the optically inactive hemisphere of May 20, 1974, suggests that the radio-quiet sun may vary during the sunspot cycle.

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