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Another explanation for the constant buzzer is the High-frequency Doppler method for ionosphere research  described in the Russian Journal of Earth Sciences, in which radio waves are reflected from ionosphere inhomogeneities. Changes of an ionosphere state can be caused by solar geophysical or seismic events. This method involves comparing a continuous radio transmission which is reflected by the ionosphere with a stable basic generator. The continuously transmitted carrier frequency currently used for this research matches that of the Russian Buzzer (4.625 MHz).