Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1371p&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 10, p. 1371-1389.
Physics
5
Auroral Arcs, Auroral Electrojets, Doppler Radar, Magnetic Anomalies, Multistatic Radar, Very High Frequencies, Continuous Wave Radar, Electron Energy, Ion Acoustic Waves, Magnetometers
Scientific paper
A CW VHF bistatic Doppler radar operated in conjunction with CANOPUS array instruments was used to demonstrate that type 4 waves can often be excited during low to moderate geomagnetic activity. It is shown that their observability is limited by the requirement of close alignment of the radar wave vector with a narrow instability cone along the auroral arc. It is suggested that when such a requirement is satisfied, refraction of radio waves may further facilitate the observation of type 4 waves by bending the radar beam along curved arc boundaries. Some results of ray tracing in a 3D ionospheric model is used to illustrate the importance of refraction in auroral forms. It is shown that the observational characteristics and the proposed explanation of type 4 echoes are consistent with these ray tracing results.
Jean-Pierre St.-Maurice
André Dieter
Creutzberg F.
Koehler James A.
Prikryl Paul
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