University of Oulu

Kallunki, J., McKay, D. & Tornikoski, M. First Type III Solar Radio Bursts of Solar Cycle 25. Sol Phys 296, 57 (2021).

First type III solar radio bursts of Solar Cycle 25

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Author: Kallunki, Juha1; McKay, Derek1,2,3; Tornikoski, Merja1
Organizations: 1Aalto University Metsähovi Radio Observatory, Metsähovintie 114, 02540, Kylmälä, Finland
2Turku University, FINCA, Vesilinnantie 5, 20014, Turun yliopisto, Finland
3Sodankylä Geophysical Observatory, University of Oulu, Tähteläntie 62, 99600, Sodankylä, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.4 MB)
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Language: English
Published: Springer Nature, 2021
Publish Date: 2021-05-10


The minimum of the previous solar cycle, Solar Cycle 24, occurred in December 2019, which also marked the start of the new Solar Cycle 25. The first radio bursts of the new solar cycle were observed in the spring season 2020. In this work we will present three type III solar bursts which were observed in May and June 2020 at radio frequencies between 18 – 90 MHz. There are two radio observatories in Finland that are capable of doing low-frequency solar radio observations: Aalto University Metsähovi Radio Observatory (MRO) and Kilpisjärvi Atmospheric Imaging Receiver Array (KAIRA) of the Sodankylä Geophysical Observatory, University of Oulu. The instruments of the two institutes have different design and characteristics, and they operate in rather different radio interference environments. We will compare simultaneous observations from these two instruments and we will also discuss the properties of these type III solar bursts.

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Series: Solar physics
ISSN: 0038-0938
ISSN-E: 1573-093X
ISSN-L: 0038-0938
Volume: 296
Issue: 4
Article number: 57
DOI: 10.1007/s11207-021-01790-9
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: KAIRA was funded by the University of Oulu and the FP7 European Regional Development Fund and is operated by Sodankylä Geophysical Observatory with assistance from the University of Tromsø. The work by Derek McKay is partly supported by the Academy of Finland project number 322535. Open access funding provided by Aalto University.
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