MICROPULSATIONS AT NEAR CONJUGATE STATIONS IN THE AURORAL ZONES AND THEIR ASSOCIATION WITH OTHER IONOSPHERIC PHENOMENA,
PACIFIC NAVAL LAB ESQUIMALT (BRITISH COLUMBIA)
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This report deals with the results of the joint operation with Stanford University at Fort Churchill, Great Whale River and its near conjugate at Byrd Station. On the assumption that data recorded at conjugate points will be very similar and will occur nearly simultaneously, attention was focused on the micropulsation and magnetograph events which occur quite frequently and introduce Birkelands Polar Elementary Storms. These have adequately sudden commencements to enable them to be timed with an accuracy of about 12 minute for a single micropulsation event. These events are preceded by a quiet interval and followed by bays, or DPs. It is suggested that the opportunity exists of examining in more detail the relative importance of local mean and geomagnetic time in the incidence of these events in different longitudes around the globe and the difference in form between daytime and nighttime events. In the frequency range of 0.005 to 3 cps, with which this report is almost entirely concerned, the balance of evidence is that conjugate points in the auroral zones are of fleeting duration in the sense that points which are conjugate one day are not necessarily conjugate next day or next week. It seems that the origin of the events lies within the magnetosphere, but a direct relation with fluctuations in the solar wind cannot be excluded.