Phase velocity studies of 34-cm E-region irregularities observed at Millstone Hill

Details Phase velocity studies of 34-cm E-region irregularities observed at Millstone Hill Phase velocity studies of 34-cm E-region irregularities observed at Millstone Hill

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..759f&link_type=abstract

(E-region irregularities; Selected Papers from the 23rd URSI General Assembly, Prague, Czechoslovakia, Aug. 28-Sept. 5, 1990. A9

Physics

6

Backscattering, E Region, Earth Magnetosphere, Incoherent Scatter Radar, Phase Velocity, Autocorrelation, Eiscat Radar System (Europe), Ion Acoustic Waves, Radar Measurement

Scientific paper

Phase velocity observations at E-region heights made with the Millstone Hill 440 MHz radar find no evidence of an ion acoustic limiting speed for phase speeds observed near 0 deg magnetic aspect angle. Under most circumstances the phase speed increases steadily with increasing backscattered power amplitude. For a 34 cm volume backscatter cross-section, less than about 5 x 10 exp -13/m, the phase speed is at or below the usual ion acoustic speed in the E-region (350 m/s), and increases only slowly with the observed backscattered power amplitude (about 50 m/s per 10 dB). At higher power levels, the phase speed exceeds 350 m/s, reaching values in excess of 750 m/s at times, and increases more rapidly with backscattered power (about 200 m/s per 10 dB). Phase velocity/time maps observed over a 3-deg span of latitude suggest that many features of the phase speeds observed are directly related to changes in the ambient convection electric field in the E-region due to changing activity conditions or the effects of superimposed magnetospheric pulsations.

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