Physics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ssrv...21..427s&link_type=abstract
Space Science Reviews, vol. 21, Feb. 1978, p. 427-467.
Physics
14
Geomagnetic Pulsations, Auroral Electrojets, Diurnal Variations, Field Aligned Currents, Magnetic Disturbances, Magnetic Signatures, Magnetic Storms, Satellite Observation, Sine Waves, Sudden Storm Commencements
Scientific paper
Numerical and physical classifications are presented for two new classes of magnetic pulsations - Pi3 and Pc6. Pi3 are pulsations of irregular waveform with periods longer than 150 sec; Pc6 are pulsations of sinusoidal waveform with periods longer than 600 sec. Pi3 pulsations are broken down into Psc5, Psc6, Pip, and Ps6 pulsations, where Psc5 and Psc6 pulsations are understood to mean damped pulsations associated with sudden commencement storms, with periods from 150 to 600 sec and upward of 600 sec, respectively. Pip and Ps6 are quasi-sinusoidal pulsations associated with magnetic substorms, with periods between 100 and 400 sec and between 5 to 40 min, respectively. The morphology and theory of Ps6-type Pi3 pulsations are examined, and a model for Ps6 pulsations is proposed, where the onset of these pulsations is attributed to the magnetic effect of a meandering of a current system involving an inflowing field-aligned current, westward ionospheric current, and outflowing field-aligned current, which expands toward the dawn and dusk sectors as the magnetospheric substorm progresses.
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