Other
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.1987s&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, March 1, 1988, p. 1987-1992.
Other
6
Earth Magnetosphere, Vlf Emission Recorders, Whistlers, Magnetospheric Instability, Power Lines, Sidebands
Scientific paper
An accurate determination is made of the sideband structure of ducted VLF whistler mode waves transmitted from Siple Station and observed at Lake Mistissini, Quebec. Single- and double-frequency experiments are described. It is shown that sideband spectra can be explained by nonlinear interactions between two or more lines in the magnetosphere, the line intensities required for such interactions being low. If one of the lines is a trnsmitted carrier, the other line can be as much as 40 dB lower in amplitude, implying that power line radiation (PLR) can be an important factor in sideband generation. It is shown that 'single-line' sidebands are due to interactions between the input wave and harmonics of 60 Hz present within the duct (assumed to be PLR), and that double-line spectra are affected by their position relative to the same 60-Hz system of lines. A study of double-line spectra as function of line separation and line amplitude ratio is made.
Helliwell Robert A.
Sa A. D. L.
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