Abstract
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.
Original language | English (US) |
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Article number | L06109 |
Journal | Geophysical Research Letters |
Volume | 33 |
Issue number | 6 |
DOIs | |
State | Published - Mar 28 2006 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Geophysics
- General Earth and Planetary Sciences