Physics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1493g&link_type=abstract
Journal of Geophysical Research, vol. 84, Apr. 1, 1979, p. 1493-1498. Research supported by the National Research Council of Ca
Physics
2
Angular Distribution, Frequency Distribution, Geomagnetic Micropulsations, Interplanetary Magnetic Fields, Statistical Distributions, Amplitude Distribution Analysis, Histograms, Magnetic Field Configurations, Statistical Correlation
Scientific paper
Hourly distributions of the angle theta XB, whose cosine is equal to the vector product of the solar ecliptic earth-sun axis and the interplanetary magnetic field (IMF), have been compared with hourly Pc 3 and Pc 4 signal activity at Calgary, Canada, for 198 hours in September, October, and November 1969. Hours whose distributions were concentrated above or below theta XB = 50 deg were correlated with a clear separation of inactive from active micropulsation intervals. The correlation was stronger for the Pc 3 than for the Pc 4 band, and hours with significant fractions, say 10-20%, of their theta XB distributions below 30 deg corresponded particularly well with high amplitudes of micropulsation signals. Signals in the Pc 3 period range on the ground can therefore be used as a crude monitor of certain extremes of IMF orientation.
Greenstadt Eugene W.
Olson John V.
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