Physics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..689b&link_type=abstract
Planetary and Space Science, vol. 25, July 1977, p. 689-701. Research supported by the Department of Transport and South Africa
Physics
1
Antarctic Regions, Geomagnetic Micropulsations, Plasmapause, Spectrum Analysis, Digital Data, Diurnal Variations, Frequency Response, Ground Stations, Kp Index
Scientific paper
The daily frequency and amplitude characteristics of Pc 3 pulsations recorded at SANAE, Antarctica, where L is of the order of 4, are discussed in terms of the estimated position of the plasmapause. Digital dynamic spectra are examined which show that Pc 3 pulsations vary in 'midband' frequency from 20 to 50 mHz, with a distinct decrease in frequency from morning to afternoon and a large variation in both frequencies and the rate of frequency decrease observed from day to day. The 'midband' frequencies for Pc 4 pulsations are found to remain constant throughout the day and not to exhibit the marked decrease in frequency seen for Pc 3 pulsations. A close correlation is discovered between variations in Pc 3 daily onset frequency and magnetic index Kp-prime, confirming the previous finding that the position of the plasmapause at 0200 hr is determined by planetary magnetic activity in the dusk-to-midnight sector.
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