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Authors: De Michelis, P.* 
Tozzi, R.* 
Meloni, A.* 
Title: On the terms of geomagnetic daily variation in Antarctica
Issue Date: 22-Jun-2009
Series/Report no.: 6 / 27 (2009)
Keywords: Geomagnetism and paleomagnetism (Time variations, diurnal to secular)
Magnetospheric physics (Polar cap phenomena; Solar wind-magnetosphere interactions)
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction 
Abstract: The target of this work is to investigate the nature of magnetic perturbations produced by ionospheric and magnetospheric currents as recorded at high-latitude geomagnetic stations. In particular, we investigate the effects of these currents on geomagnetic data recorded in Antarctica. To this purpose we apply a mathematical method, known as Natural Orthogonal Composition, to analyze the magnetic field disturbances along the three geomagnetic field components (X, Y and Z) recorded at Mario Zucchelli Station (IAGA code TNB; geographic coordinates: 74.7° S, 164.1° E) from 1995 to 1998. Using this type of analysis, we characterize the dominant modes of the geomagnetic field daily variability through a set of empirical orthogonal functions (EOFs). While such mathematically independent EOFs do not necessarily represent physically independent modes of variability, we find that some of them are actually related to well known current patterns located at high latitudes.
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