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.
Original language | English |
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Article number | 156 |
Pages (from-to) | 156 |
Journal | Solar Physics |
Volume | 293 |
Issue number | 11 |
DOIs | |
Publication status | Published - 1 Nov 2018 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Instrumental effects
- Instrumentation and data management
- Radio emission, quiet
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Equipment
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Metsähovi Radio Observatory
Joni Tammi (Manager)
School of Electrical EngineeringFacility/equipment: Facility