Measurements of the Quiet-Sun Level Brightness Temperature at 8 mm |
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Authors: | J. Kallunki M. Tornikoski |
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Affiliation: | 1.Mets?hovi Radio Observatory,Aalto University,Kylm?l?,Finland |
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Abstract: | Defining the solar brightness temperature accurately at millimeter wavelengths has always been challenging. One of the main reasons has been the lack of a proper calibration source. New Moon was used earlier as a calibration source. We carried out a new extensive set of observations at 8 mm using the New Moon for calibration. The solar and Moon observations were made using the 14-meter radiotelescope operated by the Aalto University Metsähovi Radio Observatory in Finland. In this article, we present our method for defining the brightness temperature of the quiet-Sun level (QSL). Based on these observations, we found (8100~mbox{K} pm 300~mbox{K}) to be the mean value for the QSL temperature. This value is between the values that were reported in earlier studies. |
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