Contributions of reflection poins and current sheet on scattering of energetic electrons by Kinetic Alfven Waves

Electron distributions associated with injections can be unstable to various high-frequency waves and low-frequency kinetic Alfven waves (KAW). Such scattering, often associated with resonances, causes a pitch-angle diffusion and generates diffuse auroral precipitation. In particular, standing mode KAWs can scatter pitch-angles of radiation belt electrons with energies above a few hundred keV through drift-bounce resonances, but the time scales of such scattering are too long for short-time injections. As a result, it was long thought that the main population of injected electrons, those with energies of tens to hundreds of keV, were unaffected by KAWs. In the present talk we show how KAWs can scatter electrons at two locations: near the reflection (bottleneck) points and in the current sheet. We also show how the presence of depolarization fronts change the scattering rates.