Radio observations of solar active regions at 7.36 and 37 GHz

Juha Kallunki*, Merja Tornikoski, Dmitrijs Bezrukovs

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)


We present solar radio observations that were made semi-simultaneously with two Nordic–Baltic radio telescopes observing at two different frequency bands, 7.36 GHz and 37 GHz. The two radio telescopes are the Aalto University Metsähovi radio telescope located in Kylmälä, Finland, and the Ventspils International Radio-Astronomy Center (VIRAC) radio telescope located in Irbene, Latvia. The observations presented here were made between autumn 2017 and autumn 2018. We use them to study the active solar regions that are seen in the radio intensity maps at both frequencies. We find that the location of the maximum intensity is different for the two frequency bands, and that their peak intensities do not correlate. Based on these findings we propose a simplified scenario for how the radio sources can form at centimetre and millimetre wavelengths.

Original languageEnglish
Pages (from-to)241-248
Number of pages8
JournalAstronomical and Astrophysical Transactions
Issue number3
Publication statusPublished - 1 Dec 2021
MoE publication typeA1 Journal article-refereed


  • Active region
  • Magnetic fields
  • Radio telescope
  • Solar radio brightening
  • Sunspot


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