A low-frequency (~500 Hz) mode in conjunction with symmetric sidebands, displaced by approximately 500 Hz off the carrier frequencies of 11.90 and 12.65 kHz, has been observed in experiments conducted with the Aureol 3 satellite at altitudes of 1200 km above the Komsomolsk-on-Amur Alpha Station (50 ¿N, 135 ¿E) (Sotnikov et al., 1991 and references therein). These observations are examined and interpreted with an alternative mechanism based on the theory of Lee and Kuo [1984>. The proposed mechanism suggests that the injected VLF wave parametrically excites a purely growing mode and both the Stokes and anti-Stokes sidebands of the lower hybrid waves. The Doppler-shifted frequencies of these modes resulting from the satellite motion adequately account for both the sidebands and the low-frequency mode observed in the Aureol 3 experiments. ¿ American Geophysical Union 1992