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

Juha Kallunki*, Merja Tornikoski

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)
123 Downloads (Pure)


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 languageEnglish
Article number156
Pages (from-to)156
JournalSolar Physics
Issue number11
Publication statusPublished - 1 Nov 2018
MoE publication typeA1 Journal article-refereed


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


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