Physics
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.2305h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, April 1, 1984, p. 2305-2312.
Physics
19
Atmospheric Scattering, Auroral Irradiation, Scattering Cross Sections, Very High Frequencies, Backscattering, Power Spectra, Radar Scattering, Scattering Amplitude, Ultrahigh Frequencies
Scientific paper
Observations of power spectra and backscattered signal intensities associated with auroral electron density fluctuations of nearly 1 m scale length have been made with the Scandinavian Twin Auroral Radar Experiment (STARE). The intensities of the backscattered signals, which are related to the radar scattering cross sections, have been analyzed to determine their angular distribution in the plane perpendicular to the magnetic field with respect to the direction of the electron drift velocity. The Doppler spectral characteristics of the data are used to identify the type of irregularities. The primary irregularities have a highly anisotropic scattering cross section as compared to the secondary 1 m waves. The strength of the primaries is large and strongly dependent on flow angle. The intensities of the secondaries are relatively weak and rather insensitive to angular variations. The ac variation of the backscatter amplitudes associated with the irregularities are closely correlated, indicating a common modulation mechanism dominating the two types of scatterers.
Haldoupis C. I.
Nielsen Edward
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