Other
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.5733k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 100, no. A4, p. 5733-5742
Other
4
Angles (Geometry), Auroral Echoes, Coherent Radiation, Doppler Effect, Earth Ionosphere, Radar Measurement, Spectral Line Width, Antennas, Magnetometers, Polarimetry, Radar Equipment, Velocity
Scientific paper
The spectral characteristics of smoothly varying type 2 signals were studied using two 50-MHz CW radio links. The echoes observed came from two closely located scattering volumes where the geometrical angles of observations were about 10 deg for both links but the azmuthal angles differ by 88 deg. The events reported here were selected when the spectra on both links were wide, with a comparable spectral width, but the mean Doppler shift was almost zero on one link and very high, sometimes in excess of the ion-acoustic velocity, on the other link. Highly shifted Doppler spectra were observed to be more skewed than the spectra with low shifts. The skewness was negative for negative Doppler shifts and positive for positive Doppler shifts in accordance with previous radar observations at large magnetic aspect angles. The variation of spectral width with the radial velocity or with the magnetic disturbance level exhibited two regions of linear dependence, with a larger slope at small values and a much smaller slope at higher ones. The different slopes likely reflect the change in the rate of the irregularity amplitude increase with the electric field.
Hussey Glenn C.
Koehler James A.
Kustov A. V.
Mu Jianhua
Sofko George J.
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