Spatial extent of geomagnetic events conjugate to Byrd

Five magnetometers in an east-west line and centered on the Byrd conjugate point were operated during October 1963. The correlation of the hourly range was highest between Byrd (Antarctica) and Cape Jones (Canada), the central., station, but the maximum correlation was west of the Byrd conjugate point during the morning and east after local noon. The coherency between these stations during storms or pulsations was highest for periods greater than 30 min. At periods from 1.5 to 30 min, the coherency was less than 0.5 except when pulsations occurred. The coherency was slightly higher for the amplitude of the horizontal disturbance vector than for the H component and the total force disturbance vector, while the Z component had the lowest coherency. The distribution of the Pc 5 polarization diagrams with the best fit to the Byrd diagram was centered on the Byrd conjugate point as were the pulsations with the same amplitude.