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Solar polarization observations at 3 and 13 mm
Author(s) -
Kallunki Juha,
Tornikoski Merja,
Kirves Petri,
Oinaskallio Erkki,
Aatrokoski Juha,
Mujunen Ari,
Tammi Joni
Publication year - 2020
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.202013684
Subject(s) - physics , radio telescope , polarization (electrochemistry) , solar radio , telescope , brightness , observatory , astronomy , astrophysics , brightness temperature , remote sensing , geology , chemistry
The first solar radio polarization observations at 3 mm (86 GHz) and 13 mm (22 GHz) were made at Aalto University Metsähovi Radio Observatory in Finland in spring 2019. This was the first time that 3 mm (86 GHz) and 13 mm (1.3 cm) solar polarization observations were made with the same radio telescope. In this paper, we describe the observing system and data analysis, and present the first results. We also compare our data with polarization observations made with the Nobeyama Radioheliograph and find that the results are consistent. Additionally, we determine the quiet Sun level brightness temperature at 3 mm (86 GHz) using the New Moon for reference, and obtain a mean value of 6,310 K.