Abstract
In Part I of this paper it was shown that the radio aurora as observed at v.h.f. tended to fall in three separate spirals in geomagnetic latitude and time extending from sub-auroral latitudes to the polar cap. They were termed the E (evening), N (night) and M (morning) spirals. In this paper the behaviour of the four different radar echo types observed at 55 Mc/s from Bluff, New Zealand, is examined; it is shown that diffuse echoes are predominantly associated with the E spiral, diffuse echoes with structure and short discrete echoes with the N spiral, and long discrete echoes with the M spiral. Diffuse echoes show a number of differences from the other types, namely a closer correlation with the planetary magnetic index, Kp, than with the local K-index, and differences in seasonal behaviour. All echo types tend to persist for one to three hours once they occur.
Published Version
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