A new look at type 4 echoes of radar aurora

Details A new look at type 4 echoes of radar aurora A new look at type 4 echoes of radar aurora

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611353h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,353-11,362.

Physics

9

Auroral Echoes, Radar Echoes, Radio Auroras, Doppler Radar, Type 4 Bursts

Scientific paper

The problems of type 4 echoes of radar aurora is reexamined in detail. Experimental findings are considered in order to identify and summarize the most pronounced characteristics of type 4 echoes. The most important feature is the narrow spectral component corresponding to plasma irregularities moving always with nearly fixed phased velocities at about two times the ion acoustic speed. Existing interpretations and the evaluation of their effectiveness in explaining the observations are addressed, emphasizing the elevated electron temperature mechanism. It is argued that the latter is insufficient to provide an integrated understanding of type 4 echoes. The possibility is discussed of an explosivelike three-wave interaction process in which two type 1 waves of similar wavelength couple resonantly to feed energy into the amplification of a third, type 4 wave with comparable wavelength that propagates nearly parallel to the destabilizing electron drift.

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