Physics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.1805e&link_type=abstract
Journal of Geophysical Research, vol. 80, May 1, 1975, p. 1805-1809.
Physics
2
Diffuse Radiation, Doppler Radar, Radar Measurement, Radio Auroras, E Region, F Region, Ionospheric Disturbances, Radar Antennas, Scattering Cross Sections
Scientific paper
Two widely separated 50-MHz Doppler radars were used during April 1973 to simultaneously examine the diffuse radar aurora in a spatially limited common area. The scattering cross section of the diffuse radar aurora was determined to be essentially the same at the two observing azimuths, which were separated by 43 deg. In addition, Doppler spectra obtained at the two sites indicate that the diffuse radar auroral irregularities are similar in some respects to equatorial type 2 irregularities. However, in this experiment we find two distinct velocity components for the drifting irregularities. Both components maximize in the same direction but have significantly different magnitudes, a fact that suggests that the irregularities associated with these two Doppler components may be occurring at different altitudes. We have inferred a northward E region electric field of 20-30 mV/m from the crossed beam auroral radar data, while simultaneous measurements with the nearby Chatanika incoherent scatter radar indicated an inferred northward F region field component of about 50 mV/m.
Balsley Ben B.
Ecklund Warner L.
Greenwald Ray A.
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