We. Swartz et Dt. Farley, HIGH-RESOLUTION RADAR MEASUREMENTS OF TURBULENT STRUCTURE IN THE EQUATORIAL ELECTROJET, J GEO R-S P, 99(A1), 1994, pp. 309-317
Observations of the equatorial electrojet were made with unprecedented
altitude resolution at the Jicamarca Radio Observatory in January 199
0. We obtained high-quality Doppler spectra with 250-m and sometimes b
etter altitude resolution at heights from 95 to 120 km during the dayt
ime and early evening with the large 50-MHz radar. This resolution and
coverage revealed a richness of dynamics and structure not previously
appreciated, a structure that is sometimes reminiscent of VHF radar m
aps of equatorial spread F, albeit at smaller primary scale sizes. Ind
ividual scattering centers sometimes appear to drift in large swirls o
ver many kilometers in altitude, maintaining their identity for times
occasionally as long as a minute or two. On the other hand, we also se
e rapid variations with altitude (a kilometer or less) and time (a few
seconds or less) in the Doppler spectra and signal power.