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Ann. Geophys., 14, 1317-1327, 1996
www.ann-geophys.net/14/1317/1996/
© European Geosciences Union 1996
PMSE observations at three different frequencies in northern Europe during summer 1994
J. Bremer1, P. Hoffmann1, A. H. Manson2, C. E. Meek2, R. Rüster3, and W. Singer1
1Institut für Atmosphärenphysik, D-18225 Kühlungsborn, Germany
2Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, S7N 5E2, Canada
3Max-Planck-Institut für Aeronomie, D-37189 Katlenburg-Lindau, Germany
Abstract. Simultaneous observations of polar mesosphere
summer echoes (PMSE) have been carried out during summer 1994 in northern Norway
using three radars on different frequencies: the ALOMAR SOUSY radar at Andenes
on 53.5 MHz, the EISCAT VHF radar at Tromsø on 224 MHz and the MF radar at
Tromsø 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 PMSE
also occur at 2.78 MHz. Reliable correlations between hourly backscattered power
values indicate that the PMSE structures have zonal extensions of more than 130
km and can be detected at very different scales (half wavelength) between 0.67 (EISCAT
VHF radar) and 54 m (MF radar). Using the wind values derived by the MF radar it
can 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 wind
field.
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