Abstract

Sudden bursts of plasma velocity, including an equatorward component, are often observed by EISCAT in the evening and midnight sectors. Typically, these bursts last for about 3–7 min, and are repeated in a quasi-periodic sequence. Quasi-periodic equatorward bursts are also observed by the SABRE coherent scatter radar and these measurements confirm that the pattern can extend over several degrees of latitude and at least 10° of longitude.

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