Echoing mixed-path whistlers near the dawn plasmapause, observed by direction-finding receivers at two Antarctic stations

Details Echoing mixed-path whistlers near the dawn plasmapause, observed by direction-finding receivers at two Antarctic stations Echoing mixed-path whistlers near the dawn plasmapause, observed by direction-finding receivers at two Antarctic stations

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..973s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Nov. 1982, p. 973-984. Research supported by the Science and Engineeri

Physics

17

Antarctic Regions, Ionospheric Propagation, Plasmapause, Wave Propagation, Whistlers, Earth Magnetosphere, Energetic Particles, Magnetic Field Configurations, Ray Tracing, Satellite Observation, Trapped Particles

Scientific paper

It is pointed out that the spreading of ducted whistler-mode wave energy away from field lines of magnetospheric amplification is important for the understanding of both ducted and unducted wave characteristics of the magnetosphere. Consideration of such processes may be crucial for the correct interpretation of satellite wave observations, particularly in correlative studies with magnetospheric signals observed at ground stations. The present investigation is concerned with a particular aspect of this spreading, involving the low altitude coupling between field-aligned ducts. A study is conducted of a case of mixed-path whistler propagation near the dawnside plasmapause using multistation and direction-finding techniques. It is found that mixed-path echoes can be more intense than 'pure' (involving only one duct) if coupling takes place in both hemispheres, due to multiple contributions to the same whistler component.

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