Computer Science
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27.1371h&link_type=abstract
Planetary and Space Science, vol. 27, Nov. 1979, p. 1371-1382. Science Research Council
Computer Science
Continuous Radiation, Demodulation, Geomagnetic Pulsations, High Resolution, Periodic Variations, Plasmapause, Europe, Maps, Phase Modulation, Polarization (Waves)
Scientific paper
Complex demodulation has been described in detail and applied to Pi2 pulsations in a previous paper by Beamish et al. (1979). The technique is extended to demonstrate spatiotemporal variations in the fundamental characteristics of Pc3 and Pc4 pulsations along a meridional profile extending from the U.K. to Iceland. With the exception of a high-latitude Pc4 coupled resonance the results are consistent with a -90-deg Hughes rotation (introduced by the ionosphere) of magnetospheric toroidal line resonances. Furthermore, the ionosphere appears capable of smoothing away the polarization reversal that would be expected across such amplitude maxima within the plasmasphere. However, a toroidal line resonance in the Pc3 period range about which a sense-of-polarization reversal is clearly observed on the ground is suggested as occurring at the plasmapause. This is accounted for in terms of the width of the resonance structure.
Beamish David
Hanson H. W.
Webb Douglas C.
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