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Authors: Lepidi, S.* 
Francia, P.* 
De Lauretis, M.* 
Title: Local time behaviour of low frequency geomagnetic field fluctuation power at low latitude
Issue Date: Feb-2001
Series/Report no.: 1/44 (2001)
Keywords: Geomagnetic pulsation
MHD waves and instabilities
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
Abstract: In this paper we present a statistical study of the local time behaviour of low frequency (0.7-4.0 mHz) geomagnetic field fluctuation power at a low latitude station (corrected geomagnetic latitude 36.2°N). The analysis was conducted for two contiguous years during the ascending phase of the solar cycle. We found that the power of the horizontal east-west geomagnetic field component shows a diurnal and seasonal variation which can be related to variations of the ionospheric current system (Sq) mainly produced by dynamo-action in the ionospheric E region. The power of the horizontal north-south geomagnetic field component is higher in the local afternoon with respect to the morning; this asymmetry is more evident during time intervals characterized by high solar wind dynamic pressure.
Appears in Collections:Annals of Geophysics

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