The ULF modulation of ELF-VLF emissions close to the magnetospheric boundary
The spatial extent and temporal behaviour of quasi-periodic (QP) intensity modulations of 0.5-2kHz ELF-VLF emissions were investigated in a comparative study of data collected at three Antarctic stations. Frequently, the waveforms of the ELF-VLF signals received at each site were identical. The emis...
Main Authors: | , , , , , , |
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Other Authors: | , |
Format: | Book Part |
Language: | unknown |
Published: |
Springer
1994
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Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/516690/ https://doi.org/10.1007/978-94-011-1052-5_26 |
Summary: | The spatial extent and temporal behaviour of quasi-periodic (QP) intensity modulations of 0.5-2kHz ELF-VLF emissions were investigated in a comparative study of data collected at three Antarctic stations. Frequently, the waveforms of the ELF-VLF signals received at each site were identical. The emissions are identified with the periodic modulation of the electron pitch-angle distribution by the propagation of ULF compressional fast-mode waves through a region. In addition to generation close to the equatorial plane, we propose an additional high-latitude source of QP emissions. These emissions are associated with regions of minimum-B produced by the dayside compression of the magnetosphere close to the magnetopause. |
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