Physics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..733g&link_type=abstract
Planetary and Space Science, vol. 23, May 1975, p. 733-750.
Physics
4
Auroral Zones, Geomagnetic Pulsations, Polar Regions, Correlation Coefficients, Diurnal Variations, Geomagnetic Latitude, Kp Index, Magnetic Signatures, Statistical Analysis
Scientific paper
The characteristics of long-period Pc5 pulsations (frequency 3.33-1.67 mHz; period 300-600 sec) for stations in the subauroral, auroral and polar zones are studied for 1967. These pulsations occur mainly in the auroral and polar zones, with one morning and one evening peak. The evening peak gets stronger and appears farther away from local noon with increasing geomagnetic activity. Periods are shorter and amplitudes larger in the morning than in the evening hours. Only in a small latitudinal belt (60-70 deg) do the periods tend to increase with latitude. Amplitudes are almost always maximum near the central line of the auroral zone and drop much more sharply towards lower latitudes than towards higher latitudes. Considerable diurnal variations and also variations with magnetic activity are found to exist in the occurrence-latitude and amplitude-latitude profiles. In all three regions the occurrence and the amplitude of these pulsations increase with magnetic activity to a certain level, after which results become uncertain. Periods either do not change very much or at some stations decrease as activity increases.
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