Particle and field characteristics of the dayside magnetopause energetic electron layer

The presence of a layer of energetic electrons in the inner magnetosheath region is discussed. The particle and field characteristics in this region were studied by using data from three experiments aboard the IMP-5 satellite, namely, the University of California (Berkeley) medium energy particle detectors, the University of Iowa plasma detector (Lepedea), and the NASA Goddard magnetometer. Based on observations over the dayside high latitude magnetopause region, it is found that the enhanced energetic electron layer in the inner magnetosheath is only one of several manifestations of this layer located near the magnetopause. Intense magnetic noise, enhanced plasma number and energy densities, and a decrease of the magnetic field magnitude are also present in this layer.