Freshwater ice in a cavity was studied under heating to 0 degrees C followed by cooling at a frequency of 6.3 GHz. Splitting of a resonant transmission line at 60-70 MHz was detected. This effect may be associated with the existence of two vibrational modes in ice, with the coupling between them increasing near 0 degrees C. In such a medium, two waves with identical polarizations and similar wavenumbers can exist. This assumption was confirmed experimentally by measuring the 13-GHz radiation transmission through a natural freshwater ice cover. These measurements detected signal oscillations caused by the interference of two waves, with alternation of maxima and minima with a period of 4.6 m, which corresponds to a beat frequency of similar to 37 MHz. (C) 2005 Pleiades Publishing, Inc.
展开▼
