Other
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..955g&link_type=abstract
Planetary and Space Science, vol. 26, Oct. 1978, p. 955-967.
Other
2
Geomagnetic Micropulsations, Magnetic Signatures, Magnetospheric Instability, Waveforms, Amplitude Distribution Analysis, Hodographs, Ionospheric Propagation, Power Spectra, Wave Packets
Scientific paper
An analysis was made of a complex large-amplitude Pc 4 micropulsation of four hours duration around local noon, which was observed at five ground stations in the United Kingdom (L between approximately 2.4 and 3.8). The final pulsation waveform was shown to be the results of the superposition of wave packets of different periods. The meridional variation of the amplitude of the different-period wave packets was consistent with their being fundamental 'toroidal' field-line resonances within the plasmasphere, rotated through 90 deg in their transmission through the ionosphere in accordance with recent theoretical predictions. Other predicted ionospheric effects, such as the loss of the sense-of-polarization reversal across the amplitude maximum, were apparent in the meridional variation of the polarization characteristics.
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