The contribution of geomagnetic observatories and magnetic models to the study of secular variation and jerks in Antarctica

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 t...

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Bibliographic Details
Main Authors: Meloni, A., Cafarella, L., De Michelis, P., Tozzi, R.
Other Authors: Meloni, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Cafarella, L.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, De Michelis, P.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Tozzi, R.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia, Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia
Format: Article in Journal/Newspaper
Language:English
Published: USGS 2007
Subjects:
the geomagnetic field and its time variations
secular variation and geomagnetic jerks in Antarctica
geomagnetic observatories
sign changes of the secular acceleration maps
04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
Antarctic
The Antarctic
Antarc*
Antarctica
Online Access:http://hdl.handle.net/2122/3167
http://pubs.usgs.gov/of/2007/1047/srp/srp071/index.html
https://doi.org/10.3133/of2007-1047.srp071
Description
Summary: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. Published on line only 3.4. Geomagnetismo N/A or not JCR open

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