Narrow-band extremely low frequency (ELF) wave phenomena observed at South Pole Station

Details Narrow-band extremely low frequency (ELF) wave phenomena observed at South Pole Station Narrow-band extremely low frequency (ELF) wave phenomena observed at South Pole Station

Mar 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3306109k&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 6, CiteID L06109

Physics

2

Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Plasma Waves And Instabilities (2471), Electromagnetics: Wave Propagation (2487, 3285, 4275, 4455, 6934)

Scientific paper

Extremely low frequency (ELF) magnetic pulsations which show a whistler-like spectral structure have been measured at South Pole Station. An initial survey of the first 70 days of data revealed narrow-band ELF pulsations with slowly varying frequency over time. The narrow-band (a few Hz) signatures maintain their bandwidth as their frequencies decrease from 110 to 50 Hz (and their second harmonics) over the course of 40-90 s. Although the narrow-band ELF waves have a signature somewhat similar to very low frequency (VLF) whistlers, their duration and frequency range are much different from those of whistlers; they also show an unusual characteristic where their frequency often increases before it decreases. These events show a peak in their magnetic local time (MLT) occurrence distribution near the pre-midnight region, a result that contrasts sharply with the only three previously published studies of these waves. Two possibilities of generation mechanism are discussed.

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