Abstract
It is shown that maxima which occur in the diurnal variations of ƒ 0F2 at high southern latitudes fall into two categories: 06 UT maxima which are produced by thermospheric winds and ‘secondary ionization maxima’ which occur near local magnetic noon. It is suggested that the secondary maxima may be associated with low-energy electron precipitation. Maxima also occur near local magnetic noon in the northern hemisphere in winter but, because at most of the northern stations local magnetic noon and local noon practically coincide, it is difficult to decide whether these maxima are occurring at local magnetic noon or merely at local midday.
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