A two-dimensional array study of low-latitude Pc 5 geomagnetic pulsations

Details A two-dimensional array study of low-latitude Pc 5 geomagnetic pulsations A two-dimensional array study of low-latitude Pc 5 geomagnetic pulsations

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813703z&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,703-13,713.

Physics

24

Diurnal Variations, Extremely Low Radio Frequencies, Plasma Waves, Plasmasphere, Polarization (Waves), Geomagnetism, Power Spectra, Wave Generation

Scientific paper

Data obtained from the Australia Wide Array of Geomagnetic Stations (AWAGS) have provided a unique opportunity to investigate the spatial variation of long-period (Pc 5) ULF wave signal characteristics as a result of plasma waves in low latitudes. Pure state filtering techniques were applied in order to detect highly polarized Pc 5 events and derive the wave signal parameters. The results indicate that the Pc 5 signal frequency was virtually independent of latitude and longitude, while the amplitude decreased considerably toward lower latitudes. The spatial variation of the signal polarization was small. However, a statistical analysis of the signal polarization revealed a systematic diurnal variation. Counterclockwise sense of rotation with the major axis of the polarization ellipse in the northeast quadrant was observed in the local morning, while clockwise sense of rotation with the polarization major axis aligned mainly in the north-south direction was seen in the local afternoon. Interstation phase analysis yielded small phase variations across the entire station array, indicating azimuthal wave numbers of 1-3. These observations appear to be consistent with the magnetic ground signature of global compressional modes or large scale-cavity resonances trapped in the magnetosphere.

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