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MULTI­FREQUENCY OBSERVATIONS OF THE POLAR
RADIO STRUCTURES
A. Riehokainen 1 , A.G. Tlatov 2
1 Tuorla Observatory 21500, Piikkio, Finland;
2 Pulkovo Astronomical Observatory, St. Petersburg, Russia
alerie@utu.fi
In this work we present a comparison of the enhanced temperature regions (ETRs) in the
radio emission of the Sun with other manifestations of solar polar structures over some
days in 2003­2005. The radio observations at 37 GHz were made with the Metsahovi
Radio Telescope (Finland). We compared our radio data with di#erent SOHO/EIT and
SOHO/MDI images for the same periods. We also superposed the intensity contours of
the full­radio maps obtained in Metsahovi on the Meudon Spectroheliograph CaII(k3) and
H(alpha) images. We tried to find di#erence between ETRs inside and outside of coronal
holes. We find that the ETRs are clearly connected to brightness structures seen in the
CaII(k3)/H# and magnetic field sources seen in SOHO/MDI. Thus we can conclude that
ETRs have chromospheric origin.