Multiple Observations of Electron Diffusion Regions by the Electric Field Experiment on the Polar Satellite

During dayside magnetopause crossings by the Polar Satellite in 2001-2003, hundreds of observations were made of ~100 millisecond duration, ~50 mV/m electric fields having parallel components. These events existed in current filaments that contained important density variations and major conversions of electromagnetic energy. They are interpreted as multiple electron diffusion regions existing simultaneously inside the magnetopause. Statistical properties of these events are described.