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MULTI-FREQUENCY OBSERVATIONS OF THE POLAR RADIO STRUCTURES
A. Riehokainen1 , A.G. Tlatov
1 2 2

Tuorla Observatory 21500, Piikkio, Finland; Pulkovo Astronomical Observatory, St. Petersburg, Russia alerie@utu.fi

In this work we present a comparison of the enhanced temp erature regions (ETRs) in the radio emission of the Sun with other manifestations of solar p olar structures over some days in 2003-2005. The radio observations at 37 GHz were made with the Metsahovi Radio Telescop e (Finland). We compared our radio data with different SOHO/EIT and SOHO/MDI images for the same p erio ds. We also sup erp osed the intensity contours of the full-radio maps obtained in Metsahovi on the Meudon Sp ectroheliograph CaI I(k3) and H(alpha) images. We tried to find difference b etween ETRs inside and outside of coronal holes. We find that the ETRs are clearly connected to brightness structures seen in the CaI I(k3)/H and magnetic field sources seen in SOHO/MDI. Thus we can conclude that ETRs have chromospheric origin.