Longitudinal structure in Pi 2 pulsations and the substorm current wedge

Details Longitudinal structure in Pi 2 pulsations and the substorm current wedge Longitudinal structure in Pi 2 pulsations and the substorm current wedge

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.5489l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, July 1, 1984, p. 5489-5494.

Physics

61

Geomagnetic Micropulsations, Longitude, Midlatitude Atmosphere, Field Aligned Currents, Frequency Response, Ground Stations, Phase Deviation, Polarization Characteristics

Scientific paper

Data gathered by a chain of ground-based stations in 1978 are used to compare Pi 2 geomagnetic current pulsations at longitudes outside the current wedge and displaying characteristics of field-aligned currents. Eastward phase propagation is normally absent inside the wedge but frequent outside. The longitudinal pattern of the horizontal polarization ellipse azimuth extended beyond the meridians of the field-aligned currents and clockwise polarization occurred in proportion to distance from the field-aligned current meridians. Westward propagation was dominant west of the meridians while eastward propagation was most prominent east of the current system. The eastward propagation is shown to fit a previous model for longitudinal variation in polarization azimuth.

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