Physics
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999adspr..23.1773m&link_type=abstract
Advances in Space Research, Volume 23, Issue 10, p. 1773-1776.
Physics
6
Scientific paper
This paper presents a brief description of measurements of backscatter spectra from 15 m ionospheric irregularities in the auroral electrojets by the CUTLASS Iceland coherent HF radar. The scanning nature of the radar allows the flow angle dependence of the spectral characteristics to be determined and interferometric techniques allow the altitude of the scatter volume (E-, upper E-, or F-region) to be estimated. Several populations of backscatter spectra are observed, each with distinct velocity-spectral width and velocity-flow angle behaviours. At E-region altitudes, two populations appear to correspond to the type I (two-stream instability) and type II (gradient drift instability) spectra observed with VHF radars. However, two E- or upper E-region spectral populations with velocities up to 1000 ms-1, above the typical ion-acoustic speed, are also observed. Furthermore, a population with Doppler shifts of the opposite sense to the main body of backscatter is found.
Lester Mark
Milan Stephen E.
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