Low-frequency (0.7-7.4 mHz) geomagnetic field fluctuations at high latitude: frequency dependence of the polarization pattern

A statistical analysis of the polarization pattern of low-frequency geomagnetic field fluctuations (0.7-7.4 mHz) covering the entire 24-h interval was performed at the Antarctic station Terra Nova Bay (80.0°S geomagnetic latitude) throughout 1997 and 1998. The results show that the polarization patt...

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Bibliographic Details
Published in:Annals of Geophysics
Main Authors: L. Cafarella, P. Francia, S. Lepidi
Format: Article in Journal/Newspaper
Language:English
Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2001
Subjects:
Geomagnetic pulsation
MHD waves and instabilities
wave polarizations
Antartica
Meteorology. Climatology
QC851-999
Geophysics. Cosmic physics
QC801-809
Antarctic
The Antarctic
Terra Nova Bay
Antarc*
antartic*
Online Access:https://doi.org/10.4401/ag-3576
https://doaj.org/article/5a3e18eb196548f693bb62290c28e038
Description
Summary:A statistical analysis of the polarization pattern of low-frequency geomagnetic field fluctuations (0.7-7.4 mHz) covering the entire 24-h interval was performed at the Antarctic station Terra Nova Bay (80.0°S geomagnetic latitude) throughout 1997 and 1998. The results show that the polarization pattern exhibits a frequency dependence, as can be expected from the frequency dependence of the latitude where the coupling between the magnetospheric compressional mode and the field line resonance takes place. The polarization analysis of single pulsation events shows that wave packets with different polarization sense, depending on frequency, can be simultaneously observed.

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