Physics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..169d&link_type=abstract
Journal of Geophysical Research, vol. 83, Jan. 1, 1978, p. 169-181.
Physics
10
Signal Analysis, Very Low Frequencies, Wave Amplification, Wave Interaction, Whistlers, Phase Locked Systems, Phase Shift Keying, Spectrograms, Sweep Frequency, Waveguides
Scientific paper
A linear and nonlinear amplification during an event lasting about 20 minutes near local midnight was observed during the reception of a 6.6 kHz magnetospheric signal transmitted from Alaska. Linear amplification of the transmitter signal was about 20 dB, and nonlinear amplification produced a signal positively offset from the transmitter frequency at amplitudes over 40 dB above the unamplified transmitter signal. This signal appeared as a largely self-sustaining embryo emission under the control of the transmitter signal. The signal's phase in each nonlinear amplification event was tracked in terms of a recorded phase reference. Phase studies show that the offset embryo emission accumulating phase is often interrupted by negative phase steps, reducing offset frequency. The theory of nonlinear wave interaction between the transmitter or input wave and the embryo emission is developed to explain these features.
Amon E. S. L.
Dazey M. H.
Dowden Richard L.
Koons Harry C.
McKay A. D.
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