Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.4686k&link_type=abstract
Journal of Geophysical Research, vol. 86, June 1, 1981, p. 4686-4696.
Physics
22
Auroras, Geomagnetic Latitude, Geomagnetic Pulsations, Power Spectra, Bandpass Filters, Ionospheric Currents, Magnetic Storms, Particle Precipitation, Plasmapause, Torsional Vibration, Waveforms
Scientific paper
The spectral characteristics of magnetic Pi 2 pulsations are studied in detail using data obtained simultaneously over a wide latitudinal range from the auroral region (L = 7.5) through low latitudes (L = 1.8). Pi 2 is revealed to be observed almost simultaneously with the onset of a substorm expansion over a wide latitudinal range with a common predominant period. The Pi 2 amplitude shows a primary maximum at the auroral oval and an additional secondary maximum near the plasmapause. The Pi 2 period generally becomes shorter (longer) when the associated auroral breakup starts at lower (higher) latitudes. Pi 2 is also observed simultaneously at a pair of conjugate stations in the auroral region with similar waveforms. These observational results support the torsional oscillation model which suggests that Pi 2 is caused by the hydromagnetic torsional oscillation of the geomagnetic field line anchored on the auroral oval.
Kuwashima M.
Saito Takesi
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