Absolute calibration of solar radio flux density at 9375MHz

Details Absolute calibration of solar radio flux density at 9375MHz Absolute calibration of solar radio flux density at 9375MHz

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991acasn..32..239z&link_type=abstract

Acta Astronomica Sinica (ISSN 0001-5245), vol. 32, no. 3, Sept. 1991, p. 239-246. In Chinese.

Astronomy and Astrophysics

Astronomy

1

Calibrating, Parabolic Antennas, Radiant Flux Density, Solar Radio Emission, Horn Antennas, Radio Astronomy

Scientific paper

A large pyramidal horn and two black-body boxes were developed to measure solar radio fluxes and to correct the gain of a paraboloid antenna at 9375 MHz. During the absolute calibration, solar radio fluxes were obtained with an optimal pyramidal horn at 9375 MHz. They roughly agree with the values of TYKW at 9400 MHz. The difference between them is +/- 0.6 percent. The measuring accuracy of the fluxes is +/- 3.5 percent (the accidental error is +/- 1.3 percent and the systematic error is +/- 2.2 percent). The gain of paraboloid antenna is 40.50 +/- 0.02 dB. The factor that converts antenna temperature into radio flux is 0.3139. The computed solar radio fluxes based on the converting factor were compared with flux density from TYKW at 9400 MHz, and the ratio of S(9400)/S(9375) equal to 1.01 was obtained. The correlation coefficient is 0.95. The results indicate that using an optimal pyramidal horn to observe the sun and two black bodies with different temperatures as the temperature standards at the aperture plane of the horn is the best and most reliable method for absolute calibration of both solar radio emissive fluxes and antenna gain.

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