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Title: Pc4 Occurrence and its dependence on Kp values at low latitudes in India
Authors: Ansari, I A
Khan, M T
Keywords: Pc4 Geomagnetic Pulsations;MHD Waves;MHD Instabilities;Solar Wind;Magnetospheric Interactions
Issue Date: Feb-2012
Publisher: NISCAIR-CSIR, India
PACS No.: 94.30.cq; 96.50.Tf
Abstract: A study has been undertaken for Pc4 geomagnetic pulsations ( in 6.7 – 22.2 mHz frequency range) at three very low latitude stations, viz. Pondicherry (PON) (geomagnetic latitude 2.5ºN, geomagnetic longitude 151.97ºE), Nagpur (NAG) (geomagnetic latitude 11.72ºN, geomagnetic longitude 151.93ºE), Hanle (HAN) (geomagnetic latitude 23.38ºN, geomagnetic longitude 151.89ºE) in India employing three axis fluxgate magnetometers, established and operated by the Indian Institute of Geomagnetism (IIG), Navi Mumbai. Digital dynamic spectra (DDS) for the north-south (X), east-west (Y) and vertical (Z) components of the recorded data were constructed for each day for one year (1 January to 31 December 2005). The X and Y components of these DDS were investigated for carrying out statistical study of the dependence of diurnal and seasonal variations of occurrence of Pc4 events on Kp.

The monthly variation of Pc4 occurrence has a Kp dependence range from 0 to 9-. However, the yearly Pc4 occurrence was found to be evenly distributed with magnetic activity over Kp range from 2- to 4 at all the three stations with the peak occurrence recorded at Kp = 3-. The magnitudes of durations of Pc4 occurrence decreased in the station order PON, HAN and NAG, respectively. The prominent peaks in the seasonal Pc4 occurrence were observed at Kp = 3-, 3 for all the seasons. However, additional peaks were observed at Kp = 1-, 1 and 1+ for the autumn season. It is also worth noting that Pc4 in winter was observed during intense magnetic activity when 5+ < Kp < 8+.
Page(s): 39-47
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.41(1) [February 2012]

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