On the quiet-time Pc 5 pulsation events /Spacequakes/

Details On the quiet-time Pc 5 pulsation events /Spacequakes/ On the quiet-time Pc 5 pulsation events /Spacequakes/

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..131g&link_type=abstract

Planetary and Space Science, vol. 27, Feb. 1979, p. 131-143.

Physics

2

Earth Magnetosphere, Extremely Low Radio Frequencies, Geomagnetic Pulsations, Kelvin-Helmholtz Instability, Solar Wind, Statistical Analysis

Scientific paper

A quiet-time Pc 5 event (designated Spacequake) of March 18, 1974 was studied using global data. Its amplitude was largest in the northern part of the auroral zone and its period seemed to increase with latitude. The clockwise polarization of the event noted at Baker Lake and higher latitudes changed to counterclockwise at Fort Churchill in X-Y, X-Z and Y-Z planes. The resonance of a field line (L = 10) excited due to an instability of the Kelvin-Helmholtz type may have given rise to the observed event. It is suggested that the cause of instability was internal convection of the magnetosphere.

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