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Title: A Statistical Study of Low Latitude Pc3 Geomagnetic Pulsations
Authors: Ansari, I A
Fraser, B J
Issue Date: Apr-1985
Publisher: NISCAIR-CSIR, India
Abstract: Geomagnetic pulsations in the Pc3 period range were recorded simultaneously in south-east Australia using an array of four low latitude induction coil magnetometers over a longitudinal range of 17 at L= 1.8 to 2.7. Geomagnetic data from 25 March to 21 September 1982 was digitized and statistical study was carried out from the digital sonagrams. The Pc3 occurrence was characterized by a single midday peak. The average frequency for the azimuthal stations (Woomera, Broken Hill and Newcastle) was about 45 mHz while that for the latitudinal station (Launceston) was about 42 mHz. The Pc3 occurrence was found to be evenly distributed with magnetic activity over the Kp = 2-5 range. Launceston, however, showed lower occurrences at lower Kp value (Kp 2 +) than the other three stations. The Pc3 occurrence probability normalized with respect to Kp occurrence was maximum for Kp = 4 + at all the four stations. It is also worth noting that Pc3 in winter was observed during intense magnetic activity when 5 < Kp 9. Finally, a gradual increase in the Pc3 average, lower and upper frequencies limit with Kp was observed during the local winter months for Kp 5.
Page(s): 42-49
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.14(2&3) [April & June 1985]

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