Abstract
WE have been observing whistlers and other naturally occurring audio-frequency noise at Wellington and Dunedin, New Zealand, since July 1955. The geomagnetic latitudes of these stations are 45° S. and 50° S. respectively, the distance apart being 600 km. approximately along a geomagnetic meridian. Certain of the whistler observations have already been described1; this communication deals with the simultaneous occurrence at the two stations of the phenomenon known as ‘dawn chorus’, which has been described by Storey2 as consisting of a multitude of rising whistles, and sounding like a rookery heard from a distance. Dawn chorus is heard most frequently in the early hours of the morning and is correlated with magnetic activity; however, at present there exists no theory relating to its production or propagation.
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