Physics
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..979h&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, Aug. 1989, p. 979-981, 983-985. Research supported by the Council for Sci
Physics
4
Auroral Spectroscopy, Electron Precipitation, Space Plasmas, Very Low Frequencies, Whistlers, Electron Cyclotron Heating, Magnetospheric Electron Density, Propagation Modes, Wave Interaction
Scientific paper
Whistler mode VLF radiation propagates between opposite hemispheres of the earth in field aligned ducts of enhanced plasma density. Despite the fact that whistler theory is firmly based on the existence of such ducts, there is little knowledge of their cross-sectional size or shape. Mid-latitude (L = 4) ground based observations from Sanae, Antarctica, of ionospheric auroral optical emissions (imaged on a low-light level TV system) are observed in association with VLF radio emissions (recorded on a broadband VLF receiver). These optical emissions are interpreted as arising from electrons which interact with ducted VLF radiation via the electron cyclotron interaction. These observations provide estimates of 100 km by 400km for whistler duct cross-sections in the equatorial plane.
Hansen H. J.
Scourfield Malcolm J. W.
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