Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1482m&link_type=abstract
Journal of Geophysical Research, vol. 83, Apr. 1, 1978, p. 1482-1492. National Research Council of Canada
Physics
7
Auroras, Diffuse Radiation, Doppler Radar, Radar Scanning, Ultrahigh Frequencies, Auroral Electrojets, Bandwidth, Entropy, Magnetohydrodynamic Stability, Morning, Phased Arrays, Radar Scattering, Spectral Resolution, Spectrum Analysis, Very High Frequencies
Scientific paper
Results are presented of rapid-scan Doppler spectra of the diffuse radar aurora obtained with a 398-MHz phased array radar. Each spectrum was obtained from three consecutive 1-ms radar pulses spanning an interval of 0.04 s. Most of the results were obtained from the postmidnight period and were characterized by relatively narrow spectra having Doppler velocities which were nearly constant over an extended azimuth sector (plateau). Typically, there is a positive plateau to the west and a negative plateau to the east. In addition, transition spectra are observed which tend to be broader and have Doppler shifts intermediate between those of the positive and negative plateaus. In contrast to previous observations of the evening diffuse radar aurora, these transition spectra were not localized in one azimuth sector. A unique feature of the observations was the occurrence of double-peaked spectra, the Doppler velocities of the two peaks usually corresponding to the positive and negative plateau velocities.
Moorcroft D. R.
Tsunoda Roland T.
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