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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References
Morgan, M. G., and Allcock, G. McK., Nature, 177, 30 (1956).
Storey, L. R. O., Phil. Trans. Roy. Soc., A, 246, 113 (1953).
Morgan, M. G., and Dinger, H. E., Nature, 177, 29 (1956).
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ALLCOCK, G., MARTIN, L. Simultaneous Occurrence of ‘Dawn Chorus’ at Places 600 km. Apart. Nature 178, 937–938 (1956). https://doi.org/10.1038/178937a0
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DOI: https://doi.org/10.1038/178937a0
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