Abstract
The measurement of ionospheric drifts was carried out during the period 1968–1969 by the close-spaced receiver method (2.2 MHz) operating simultaneously at vertical and slightly oblique incidence. The observing sites were separated by about 100 km. The horizontal drift velocity was evaluated by the ‘method of similar fades’. The statistical drift patterns at the two sites are in agreement with the well-known patterns of general atmospheric circulation at ionospheric levels. Differences are noted, however, in the character of the averaged diurnal variations of the E-W and N-S drifts from the two sites. Even so, and in spite of the fact that the spacing of the reflection points is about 50 km in the horizontal direction, the drift speeds and directions obtained at the two sites simultaneously agree reasonably well.
Published Version
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