Measurements of the Quiet-Sun Level Brightness Temperature at 8 mm

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openAccess

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Journal Title

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Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2018-11-01

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Mcode

Degree programme

Language

en

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Solar Physics, Volume 293, issue 11

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 8100K±300K 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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Keywords

Instrumental effects, Instrumentation and data management, Radio emission, quiet

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Citation

Kallunki, J & Tornikoski, M 2018, ' Measurements of the Quiet-Sun Level Brightness Temperature at 8 mm ', Solar Physics, vol. 293, no. 11, 156, pp. 156 . https://doi.org/10.1007/s11207-018-1380-8, https://doi.org/10.1007/s11207-018-1380-8