BBELF and Electromagnetic VLF Wave Cavities in the Auroral Ionosphere

Details BBELF and Electromagnetic VLF Wave Cavities in the Auroral Ionosphere BBELF and Electromagnetic VLF Wave Cavities in the Auroral Ionosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm44a..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SM44A-07

Computer Science

Sound

2471 Plasma Waves And Instabilities, 2704 Auroral Phenomena (2407)

Scientific paper

The GEODESIC sounding rocket (February 26, 2000) encountered dozens of VLF wave-filled density depletions in the auroral ionosphere at the time of a substorm onset. These cavities were similar to lower-hybrid cavities observed by many previous sounding rockets and by the Freja satellite, but with several striking differences: 1) VLF waves (near and above the lower-hybrid cutoff frequency fLH) inside the cavities had a strong magnetic component. In fact the magnetic fields were enhanced more strongly, relative to fields outside cavities, than were VLF electric fields. 2) The cavities were found primarily in a return (downward) current region. 3) Cavity waves show no indication of counter-rotating eigenmodes that have been demonstrated previously to indicate passive scattering of externally incident VLF hiss. These points lead us to conclude that the waves were generated inside the cavities, presumably by unstable filaments of upward-drifting thermal ionospheric electrons. Broad-band electrostatic ELF waves were also strongly enhanced inside cavities, and extended up to fLH. These waves also appear to have a geophysical origin, and likely contributed to observed ion heating up 10 eV observed in and near cavities.

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