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Simultaneous observations of polar mesospheresummer echoes (PMSE) have been carried out during summer 1994 in northern Norwayusing three radars on different frequencies: the ALOMAR SOUSY radar at Andeneson 53.5 MHz, the EISCAT VHF radar at Tromsø on 224 MHz and the MF radar atTromsø on 2.78 MHz. During the common measuring period in July/August 1994,PMSE could be detected at 224 and 53.5 MHz, and there are strong hints that PMSEalso occur at 2.78 MHz. Reliable correlations between hourly backscattered powervalues indicate that the PMSE structures have zonal extensions of more than 130km and can be detected at very different scales (half wavelength) between 0.67 (EISCATVHF radar) and 54 m (MF radar). Using the wind values derived by the MF radar itcan be shown that the mesospheric wind field influences the structure of PMSE.The diurnal variation of PMSE is strongly connected with tidal-wind components,whereas spatial differences of PMSE can partly be explained by the mean windfield

PMSE observations at three different frequencies in northern Europe during summer 1994