High-latitude ground observations of Pc 1/2 micropulsations

Details High-latitude ground observations of Pc 1/2 micropulsations High-latitude ground observations of Pc 1/2 micropulsations

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9821481p&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,481-21,491

Physics

11

Diurnal Variations, Earth Ionosphere, Earth Magnetosphere, Geomagnetic Micropulsations, Geomagnetism, Plasma Waves, Plasmapause, Solar Wind, Cyclotron Resonance, Plasma Drift, Plasma Pressure, Wave Propagation

Scientific paper

A ground-based survey of Pc 1/2 (0.1 - 0.4 Hz) and Pc 1 micropulsations throughout 1986 has provided evidence for the location of the Pc 1/2 source region. Data were taken from three high-latitude stations, located at South Pole (-75 deg geomagnetic latitude; 1530 UT local noon), Sondre Stromfjord (+74 deg, 1330 UT LN) and Siple (-61 deg, 1700 UT LN). The study revealed a diurnal occurrence pattern for waves in the 0.1 - 0.4 Hz band (Pc 1/2) and showed that the pattern was not due to the effects of sunlight on the ionosphere but instead from a postnoon magnetospheric source region. On the basis of the latitudinal occurrence patterns of the waves above and below 0.4 Hz, it is concluded that the waves observed on the ground above 0.4 Hz come primarily from plasmapause latitudes, while the source of the Pc 1/2 lies between the plasmapause and the magnetopause. The estimate of source locations for waves above and below this frequency, combined with the typically sharp frequency limit of waves in the 0.1 - 0.4 Hz (Pc 1/2) are interpreted as evidence that He(+) ions in the outer magnetosphere influence propagation and possibly wave growth.

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