Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.5911g&link_type=abstract
Journal of Geophysical Research, vol. 81, Dec. 1, 1976, p. 5911-5920. Research supported by the National Research Council of Ca
Physics
6
Geomagnetic Micropulsations, Interplanetary Magnetic Fields, Magnetic Effects, Magnetic Field Configurations, Magnetic Signatures, Waveforms, Amplitudes, Magnetic Spectroscopy, Spectrograms
Scientific paper
Analysis of Pc 3, 4 micropulsation wave forms recorded at Calgary in September 1969 shows a tendency toward signal enhancement in cases where the interplanetary magnetic field is at a small angle to the sun-earth line. Scatter plots of hourly Pc 3, 4 amplitudes exhibit a definite trend toward large signals when this angle is less than 50 or 60 degrees, and a corresponding disappearance of significant amplitudes when the angle is greater than 60 degrees. There is, however, an appreciable variability in individual cases. Power density spectrograms improved the correlation of pulsation strength with low angle in some cases.
Greenstadt Eugene W.
Olson John V.
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