Spatial characteristics of wave-like structures in diffuse aurora obtained using optical observations

摘要: Abstract. We present the results of a statistical study using optical images from ALIS (Auroral Large Imaging System) to investigate spatial and temporal variations structures in diffuse aurora. Analysis conjugate Reimei data shows that such fine are result modulation high-energy precipitating electrons. Pitch angle diffusion into loss cone due interaction whistler mode waves with plasma sheet electrons is most feasible mechanism leading electron precipitation. This suggests structure an indication modulations efficiency wave–particle interaction. The scale sizes these structures, mapped magnetosphere, can give us information about characteristics modulating wave activity. found size auroral stripes spacing between them be on average 13–14 km, which corresponds 3–4 ion gyro radii for protons energy 7 keV. move southward speed close zero convection frame.