Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ap%26ss..31...81g&link_type=abstract
Astrophysics and Space Science, vol. 31, Nov. 1974, p. 81-101.
Astronomy and Astrophysics
Astrophysics
Auroral Zones, Geomagnetic Pulsations, Periodic Variations, Polar Regions, Statistical Analysis, Annual Variations, Diurnal Variations, Geomagnetic Micropulsations, Twenty-Seven Day Variation
Scientific paper
Geomagnetic data for the year 1967 from seven Canadian observatories, spanning the subauroral, auroral and polar zones, have been analyzed to investigate the characteristic variation of Pc5 period with several geophysical variables. Pulsations with smaller periods occurred more frequently at lower latitudes while those with longer periods occurred more frequently at higher latitudes. Daily variation of the periods of Pc5 showed little change with seasons or with magnetic activity. Periods, in general, had two daily maxima which appeared at different local times in different zones. A predominant morning peak was noted at all stations except Baker Lake, where a mid-day maximum of the period was found. The Pc5 periods tended to increase with geomagnetic activity at lower latitude stations, and to decrease with activity at stations in the polar cap for low to moderate Kp levels. At high activity levels these trends appeared to reverse, though results are less certain.
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