ULF Pc5-6 magnetic activity in the polar cap as observed along a geomagnetic meridian in Antarctica

Details ULF Pc5-6 magnetic activity in the polar cap as observed along a geomagnetic meridian in Antarctica ULF Pc5-6 magnetic activity in the polar cap as observed along a geomagnetic meridian in Antarctica

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1195y&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A8, pp. SMP 22-1, CiteID 1195, DOI 10.1029/2001JA900143

Physics

7

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Polar Cap Phenomena

Scientific paper

Latitudinal and diurnal distributions of spectral power and spatial coherency parameters of the geomagnetic variations in the Pc5-6 (1-6 mHz) frequency range are analyzed using data of magnetometer stations in Antarctica. The available stations give the possibility to form a latitude chain along the geomagnetic meridian 40°E stretching from magnetic latitude 69°S to 86°S. Long-period ULF activity at polar cap latitudes is characterized by lower amplitudes and wider spectra with lower central frequencies as compared with typical auroral Pc5 pulsations. The meridional distribution of average Pc5-6 spectral power is nonmonotonic and has a minimum near 80°. In general, the low-frequency broadband ULF activities in the polar cap and at auroral latitudes seem to be decoupled. This long-period ULF activity in the polar cap could be an image of wave activity in the tail lobes or the manifestation of turbulent component of the ionospheric convection at very high latitudes, but this requires further investigation.

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