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More than 2 yr of continuously recorded signal amplitude data from the MSKtransmitters NRK/TFK (37.5 kHz, Iceland) and NSY (45.9 kHz, Sicily)received at (52° N 8° E) in the time range from August 2009to September 2011 are analyzed with regard to planetary wave activity.Wavelet analysis of the day/night amplitude ratio reveals clear evidence ofquasi 16 day periods mainly during winter time as well as traces of 5 and 10day periods on both paths. The amplitude ratio is well correlated to thetypical stratospheric (10 hPa) seasonal temperature profile – more clearlyto be seen on the northern path. The results are in line and an extension ofmanifold research with regard of ionospheric absorption phenomena caused byatmospheric wave activity. Continuous monitoring of transmitters in the40 kHz frequency range proved as an inexpensive tool for investigatingmesospheric response to forcing from below

Data analysis of low frequency transmitter signals received at a midlatitude site with regard to planetary wave activity