Physics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.2481o&link_type=abstract
Journal of Geophysical Research, vol. 83, June 1, 1978, p. 2481-2488. Research supported by the National Research Council of Ca
Physics
33
Geomagnetic Micropulsations, Phase Shift, Auroral Electrojets, Correlation, Diurnal Variations, Earth Magnetosphere, Magnetometers, Magnetopause, Phase Velocity, Polarization (Spin Alignment), Regression Analysis, Universal Time
Scientific paper
A set of 61 relatively uncontaminated Pc 4-5 micropulsations detected by an east-west line of magnetometers between July 1 and October 10, 1974 were examined for longitudinal phase changes. The direct correlation between longitudinal phase shift and frequency is found to be m = (1.4 + or - 0.4)f + 0.26, where m is the azimuthal wave number derived from the measured phase shift and f is the frequency in millihertz. The relationship indicates a phase velocity independent of frequency and with a magnitude equal to 14 km/s. Phase shift sign, and thus apparent phase velocity direction, changes abruptly 1-2 hrs before local noon; the signals appear to propagate away from this prenoon region toward the terminators so that they move westward in the morning hours and eastward during the afternoon hours. Both the magnitude and the sign of this phase velocity are consistent with proposed generation mechanisms which invoke the Kelvin-Helmholtz instability at the magnetopause boundary.
Olson John V.
Rostoker Gordon
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