Other
Scientific paper
Dec 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969natur.224.1191i&link_type=abstract
Nature, Volume 224, Issue 5225, pp. 1191-1192 (1969).
Other
Scientific paper
WE present here a discussion of how a new implication of the plasma acoustic theory1 is related to some optical observations of auroras. We also discuss some experimental observations of magnetic and radio events at Saskatoon (magnetic latitude 60°). Since the idea of instabilities in the equatorial electrojet was extended to the case of the auroral electrojet1, many auroral radio studies2-5 have turned in this direction. Peak occurrence of echoes at a height of 100-120 km and speeds of 350-360 m/s have been obtained in some of the investigations3, and from others4 a peak echo occurrence at 110 km and average speeds of 310 m/s are suggested. In the latter, morning echoes could not have been due to plasma acoustic propagation, and in the others3 a ``threshold effect'' was observed in relation to magnetic events. This simply means that echoes appeared only when the intensity of the electrojet and hence the magnetic field exceeded a minimum value. Our interest in the present study is directed towards examination of a few experimental results of optical, magnetic and radio studies (made at Saskatoon) in relation to plasma acoustic propagation in the ionosphere.
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