Phase structure of low-latitude Pc3-4 pulsations

Details Phase structure of low-latitude Pc3-4 pulsations Phase structure of low-latitude Pc3-4 pulsations

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991p%26ss...39..569w&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 39, April 1991, p. 569-577, 579-582. Research supported by Australian Researc

Physics

14

Earth Magnetosphere, Extremely Low Frequencies, Geomagnetic Micropulsations, Maximum Entropy Method, Power Spectra, Wave Packets, Wave Propagation

Scientific paper

Physically realistic models of ULF wave generation and propagation must embody amplitude spectrum and phase characteristics. This paper describes two techniques which may be used to evaluate the spectral and temporal evolution of phase properties in ULF signals. The procedures were tested on synthetic Pc3 pulsation-like signals before application to real multistation low-latitude ground data. Phase analysis like this introduces a new dimension to the interpretation and modeling of ULF wave processes. For instance, the identification of harmonic and packet structures is greatly facilitated. Examination of multistation phase-time properties allows group structure, spatial coherency, and group velocities to be inferred. In one example group propagation in a south-easterly direction is inferred at 8-17 km/s.

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