Abstract
WE describe here an experiment in which the modulation radiated by a high frequency radio transmitter is transferred by an ionospheric process to waves of low and very low frequency (LF and VLF). This is the first observation of so called “cross modulation” for waves of frequencies below 167 kHz and this result has important implications regarding the electron energy and collision frequency in the lowest regions of the ionosphere.
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JONES, T., DAVIES, K. & WIEDER, B. Observations of D-Region Modifications at Low and Very Low Frequencies. Nature 238, 33–34 (1972). https://doi.org/10.1038/238033a0
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DOI: https://doi.org/10.1038/238033a0
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