Abstract
THE signal strength and Doppler frequency spectra of v.h.f. backscatter radar echoes from the equatorial electrojet are being recorded at Thumba near Trivandrum (dip ∼ 1 °S). The v.h.f. radar operates on 54.95 MHz, with identical arrays of Yagi antennae for transmission and reception; the beam axis is orientated either vertically or obliquely at 30° to the vertical. Analysis of the radar backscatter signals and the magnetograms at Thumba has revealed that quasi-periodic fluctuations of the electrojet on time scales of a few tens of minutes are very frequent. We report here some typical experimental results on this phenomenon.
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