Abstract
The Polar Ionospheric X-ray Imaging Experiment (PIXIE) and the Ultraviolet Imager (UVI) on the POLAR satellite have provided the first simultaneous global scale views of the patterns of electron precipitation through imaging of the atmospheric X-ray bremsstrahlung and the auroral UV emissions. While UVI responds to the total electron energy input, PIXIE responds only to the high energy (multi-keV) electron precipitation. During the substorm expansion phase, clear time delays occur between the electron injection at the nightside and the start of the precipitation on the morning/dayside. The observations are generally consistent with patterns previously deduced from ground-based and suborbital observations.
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