Observations of highly correlated near-simultaneous magnetic field perturbations at contraposed ground stations

A merged data set from Canadian Auroral Network for the OPEN Program Unifie d Study (CANOPUS) and Magnetometers-Ionospheric Radars-All-Sky Cameras Larg e Experiment (MIRACLE) magnetometer stations is used to study variations ob served at widely separated locations. Three years of 10-s data are analyzed using canonical correlation techniques to determine the temporal offset of similar fluctuations observed at pairs of sites. Nearly simultaneous (<2-m in delay) signatures are often found between sites separated by 12 hours ma gnetic local time, with no evidence of more slowly propagating events (> 10 -min delay). Correlated episodes occur more often (roughly 10% of the time) when sites are in the dawn/dusk sectors and less often (similar to5%) for noon/midnight configurations.