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

Juha Kallunki; Merja Tornikoski

doi:10.1007/s11207-018-1380-8

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

Juha Kallunki^*, Merja Tornikoski

^*Corresponding author for this work

Metsähovi Radio Observatory

Research output: Contribution to journal › Article › Scientific › peer-review

3 Citations (Scopus)

144 Downloads (Pure)

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
Article number	156
Pages (from-to)	156
Journal	Solar Physics
Volume	293
Issue number	11
DOIs	https://doi.org/10.1007/s11207-018-1380-8 https://doi.org/10.1007/s11207-018-1380-8
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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10.1007/s11207-018-1380-8Licence: CC BY
10.1007/s11207-018-1380-8

ELEC_Kallunki-Tornikoski2018_Article_MeasurementsOfTheQuiet-SunLeveFinal published version, 1.21 MBLicence: CC BY

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Metsähovi Radio Observatory
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School of Electrical Engineering
Facility/equipment: Facility

Cite this

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