Abstract
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 language | English |
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Pages (from-to) | 241-248 |
Number of pages | 8 |
Journal | Astronomical and Astrophysical Transactions |
Volume | 32 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Dec 2021 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Active region
- Magnetic fields
- Radio telescope
- Solar radio brightening
- Sunspot
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Metsähovi Radio Observatory
Tammi, J. (Manager)
School of Electrical EngineeringFacility/equipment: Facility