First VHF auroral radar interferometer observations

Details First VHF auroral radar interferometer observations First VHF auroral radar interferometer observations

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..401p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 10, May 1983, p. 401-404.

Physics

29

Auroral Zones, Interferometry, Magnetohydrodynamic Stability, Radar Measurement, Radio Interferometers, Power Spectra, Radar Echoes, Radar Scattering, Very High Frequencies

Scientific paper

Auroral plasma instabilities were investigated using the radar interferometer technique based on observations obtained with a 49.92 MHz, 20-25 KW peak power pulsed radar located in Ithaca, NY (42.5 degrees N, 76.4 degrees W). Strong auroral echoes obtained during several highly active periods were analyzed. Phase differences between the signals received on the two antennas were utilized to accurately determine the E-W position, within the scattering volume, of localized scattering centers, and changes in this phase were used to determine the corresponding velocity. The radial (essentially N-S) motion was described by the signal Doppler shift. It is found that these data provide detailed information on the turbulent structure of the echoing region and show clearly that different features in the Doppler power spectrum often represent signals coming from different locations. It is concluded that these data can be utilized to determine full horizontal velocity vectors and hence the horizontal electric field, usually with a time resolution of the order of 15-30 s.

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