Hourly Changes in Conjugate Location Determined From Absorption and Field Data


  • W. H. Campbell


The ionospheric absorption detected by five-riometer arrays and the concurrent magnetometer records from Great Whale River, Canada, and Byrd, Antarctica, were studied during mildly active periods of August 23, 1966, and April 24, 1967. Through use of the four methods of absorption gradient variation, correlated absorption region, triangulated current, and field pulsation patterns, evidence of hourly change in apparent conjugate location was sought. The riometer data showed analogous changes in the two hemispheres but rather random variations in conjugate position. The field pulsation patterns were not interpretable. The relative north-south position of the auroral electrojets from the two stations indicated a regular change in the outer magnetosphere, which probably caused a variation in the conjugate location.