Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113583f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13583-13592.
Physics
37
Auroral Zones, E Region, Electron Energy, Plasma Waves, Doppler Effect, Interferometry, Ion Acoustic Waves, Night Sky, Phase Velocity, Power Spectra, Radar Data
Scientific paper
The obserations of 3-m auroral E region plasma waves with a high-resolution radar interferometer at Ithaca are reported. During postmidnight periods of very strong magnetic activity at Ottawa, the backscattered power and Doppler spectra were observed to vary rapidly with time and range, and some spectra had both mean Doppler shift and half-power width in excess of 200 Hz. In addition, when the current was parallel to the radar line of sight, short-lived sharp spectral peaks corresponding to phase velocities of about 1 km/s sometimes appeared. The shape of the peaks and their time evolution indicate that they represent a true two-stream instability, implying high (up to 900 m/s) ion acoustic velocity in the medium, which, in turn, means an E region electron temperature of 2000 K or higher at latitudes as low as L = 3.5. This interpretation is consistent with recent E region incoherent scatter measurements.
Farley Donald T.
Fejer Bela G.
Providakes James
Swartz Wesley E.
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