Some Features of Geomagnetic Micropulsations Observed During the Recent Quiet Solar Years, with Particular Reference to Data Obtained at the Near Conjugate Stations of Great Whale River and Byrd

Abstract

Summary In dedicating this paper to Professor Sydney Chapman, the authors have taken the opportunity of describing some of the salient features of the early history of geomagnetic micropulsations since 1918, which were responsible for the Canadian interest in this field and the type of equipment still in use at many ground stations. In a sense, this is a review paper of the more recent work in this field, thus excluding that covered by other reviews such as that of Troitskaya (1964) and Kato, Saito and other workers in Japan. The importance of observations at polar stations is touched upon in relation to similar observations at mid-latitude stations during the recent years of quiet solar conditions when the 27-day solar rotation period is often prominent. This period is especially well-marked at the two near-conjugate stations, Byrd and Great Whale River, in the southern and northern auroral zones. The correlation between these two stations is only briefly mentioned, since it will be the subject of a separate report. The paper concludes with a brief discussion of the very important results of satellite observations. Better co-ordination of satellite data with that received on the ground is needed and internationally planned operations of land stations for the coming years of greater solar activity are necessary.