First Type III Solar Radio Bursts of Solar Cycle 25

• Published in: Solar Physics
• Main Authors: Kallunki, Juha, McKay, Derek, Tornikoski, Merja
• Other Authors: Metsähovi Radio Observatory, Aalto-yliopisto, Aalto University
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Netherlands 2021
• Subjects: Corona; radio emission; Instrumentation and data management; Radio bursts; type III; Tromsø; Sodankylä; Troms; University of Tromsø
• Online Access: https://aaltodoc.aalto.fi/handle/123456789/107127; https://doi.org/10.1007/s11207-021-01790-9

Funding Information: 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. Funding Information: The low wavelength antenna presented here is manufactured by Reeve Engineering, http://www.reeve.com. The Callisto spectrometer was designed by Christian Monstein, http://www.e-callisto.org. KAIRA was funded by the University of Oulu and the FP7 European Regional Development Fund and is operated by Sodankyl? Geophysical Observatory with assistance from the University of Troms?. The work by Derek McKay is partly supported by the Academy of Finland project number?322535. Publisher Copyright: © 2021, The Author(s). Copyright: Copyright 2021 Elsevier B.V., All rights reserved. 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 Metsahovi Radio Observatory (MRO) and Kilpisjarvi Atmospheric Imaging Receiver Array (KAIRA) of the Sodankyla 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. Peer reviewed