Flow and aspect angle dependence of 3-m irregularities in the auroral E region

Details Flow and aspect angle dependence of 3-m irregularities in the auroral E region Flow and aspect angle dependence of 3-m irregularities in the auroral E region

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1501a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1501-1507. Research supported by NSERC.

Physics

10

Auroral Zones, E Region, Ionospheric Disturbances, Magnetohydrodynamic Stability, Radar Data, Space Plasmas, Backscattering, Scattering Cross Sections

Scientific paper

Measurements from the bistatic auroral radar system radars have been used to derive the dependence of the relative backscatter cross section on flow angle, aspect angle, and irregularity drift velocity. Aspect angles between 87 and 81 deg and drift velocities up to 700 m/s could be covered. The variation of the backscatter cross section shows general agreement with the growth rate for two-stream instability. The flow-angle dependence is approximately a cos-sq variation, whose amplitude increases with velocity and decreases with aspect angle. The aspect-angle dependence shows almost no variation with velocity; the cross section decreases steeply between 87 and 86 deg and stays constant between 86 and 81 deg.

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