Computer Science – Sound
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9.1120b&link_type=abstract
Geophysical Research Letters, vol. 9, Sept. 1982, p. 1120-1123.
Computer Science
Sound
32
Auroral Spectroscopy, Auroras, Harmonic Radiation, Kilometric Waves, Isis Satellites, Signal Detection, Spectral Bands
Scientific paper
When the ISIS 1 satellite passes through the auroral kilometric radiation (AKR) source region the sounder receiver often detects harmonic bands of radiation associated with the fundamental AKR band. These harmonic components were earlier attributed to a nonlinear instrumental response to the strong wide-band bursty AKR fundamental signal. Evidence is here presented that indicates that these harmonics are of natural origin, namely: (1) all the harmonic signals are sometimes observed to have nearly the same bandwidth, (2) when the fundamental signal has two components the harmonic signal sometimes corresponds to the weaker rather than the stronger component, (3) a weak harmonic can be observed to be associated with a weak fundamental, and (4) a 'harmonic' signal can be observed when there is no fundamental.
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