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: Lepidi, S., Francia, P., Cafarella, L.
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
04.05.99. General or miscellaneous
Antarctic
Terra Nova Bay
The Antarctic
Antarc*
antartic*
Online Access:https://www.annalsofgeophysics.eu/index.php/annals/article/view/3576
https://doi.org/10.4401/ag-3576
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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