Observations of Narrow-Band ˜60-100 Hz Waves at High Auroral Latitudes

Details Observations of Narrow-Band ˜60-100 Hz Waves at High Auroral Latitudes Observations of Narrow-Band ˜60-100 Hz Waves at High Auroral Latitudes

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm23a0464k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM23A-0464

Other

2704 Auroral Phenomena (2407), 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms

Scientific paper

ELF magnetic pulsations have been measured using a new induction coil magnetometer having a frequency response in the ELF (Extremely Low Frequency) range ( ˜0.1-250 Hz), which has recently been installed at South Pole Station. An initial survey of the first month of data revealed very interesting phenomena, including narrow-banded ELF pulsations with slowly varying frequencies and ELF 'hiss' in the ˜10-130 Hz frequency range. The narrow-band signatures maintain their bandwidth as their frequencies change slowly, typically from 100 to 60 Hz over the course of the order of ˜40-90 seconds. Although the narrow-band waves have a signature somewhat similar to VLF (Very Low Frequency) whistlers in the sense that their frequencies typically decrease with time, their duration and frequency range are much different than whistlers; they also show an unusual characteristic where their frequency often increases before it decreases. An initial survey of these events shows a peak in their occurrence distribution near the pre-midnight region, implying a possible association with substorm occurrences, a result that contrasts sharply with the only two other published studies of these waves. In this presentation, we show results of a more complete study, including polarization characteristics of these waves, comparison with other data to determine the geophysical conditions present when they occur and a more complete statistical result of their occurrence distribution.

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