Ionospheric Absorption in Conjugate Regions and Possible Oscillation of the Exosphere

Abstract

SINCE early 1963, observations of ionospheric absorption have been conducted at three pairs of magnetically conjugate stations situated at high magnetic latitude. The positions of the stations are given in Table 1, the three northern stations being in Canada and the three southern stations in Antarctica. According to computations using an expansion of the geomagnetic field1, the pairs of stations are within 100 km of magnetic conjugacy. Great Whale River and Byrd lie near the maxima of the auroral zones, the other pairs of stations being respectively inside and outside the auroral zones.