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Authors: Meloni, A.* 
Cafarella, L.* 
De Michelis, P.* 
Tozzi, R.* 
Title: The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica
Journal: USGS Open-File Report 2007-1047, Short Research Paper 071 
Series/Report no.: / Short Research Paper 071 (2007)
Publisher: USGS
Issue Date: 2007
DOI: 10.3133/of2007-1047.srp071
Keywords: the geomagnetic field and its time variations
secular variation and geomagnetic jerks in Antarctica
geomagnetic observatories
sign changes of the secular acceleration maps
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
Abstract: Some of the most interesting features of the geomagnetic field and its time variations are displayed in polar areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the magnetic field at a given location. Unfortunately, on the Antarctic continent the distribution of the permanent ground- based observatories does not permit a uniform coverage of the examined area. Furthermore, the magnetic records are characterized by intense external disturbances and noise that make the analysis of the magnetic field difficult. To improve our knowledge of the secular variation and detect the presence of secular variation impulses (geomagnetic jerks) in Antarctica, we use both observatory data and the CM4 quiet time magnetic field model. In particular CM4 improves our knowledge of geomagnetic jerks over Antarctica through the study of the sign changes of the secular acceleration maps.
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