Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7729k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A5, p. 7729-7736.
Other
3
Auroral Echoes, Coherent Electromagnetic Radiation, Electric Fields, Ionospheric Electron Density, Radar Measurement, Eiscat Radar System (Europe), Electrojets, Polar Regions, Space Plasmas
Scientific paper
Simultaneous observations of the Polar Geophysical Institute 83-MHz auroral radar and the European Incoherent Scatter facility were used to study the coherent echo threshold phenomenon. It is shown that, for electric fields not far from the Farley-Buneman instability threshold of about 20 mV/m, the onset of echo occurrence was due to an electron density increase above some threshold value. This value was estimated to be about 2.5 x 10 exp 11/cu m. For smaller electric fields of 5-10 mV/m, echoes were not observed even for electron densities double the above threshold value. The importance of both factors, electric field and electron density, and some other effects are discussed in light of recent studies of coherent echo intensities and their dependence on plasma conditions at electro jet altitudes.
Jones Owen L. G.
Koehler James A.
Kustov A. V.
Sofko George J.
Uspenskii M. V.
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