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Using observations with the ALOMAR SOUSYradar near Andenes (69.3°N, 16.0°E) from 1994 until 1997 polar mesospheresummer echoes (PMSE) have been investigated in dependence on geomagnetic Kindices derived at the Auroral Observatory Tromsø (69.66°N, 18.94°E). Duringnight-time and morning hours a significant correlation between thesignal-to-noise ratio (SNR) of the radar results and the geomagnetic K indicescould be detected with a maximum correlation near midnight. The correlationbecomes markedly smaller in the afternoon and early evening hours with a minimumnear 17 UT. This diurnal variation is in reasonable agreement with riometerabsorption at Ivalo (68.55°N, 27.28°E) and can be explained by the diurnalvariation of ionization due to precipitating high energetic particles.Therefore, a part of the diurnal PMSE variation is caused by this particleprecipitation. The variability of the solar EUV variation, however, has nosignificant influence on the PMSE during the observation period.  <b>Keywords: </b>Ionosphere (auroral ionosphere) -Magnetospheric physics (energetic particles, precipitating) - Radio science(remote sensing

Geomagnetic control of polar mesosphere summer echoes