Abstract
Another envelope soliton event below the H+ gyrofrequency andlocalized density depletion has been discovered in the low auroral region (~1760 km)by the Freja satellite. This envelope soliton has acharacteristic frequency at ~190 Hz, which is alsoclose to the resonance frequency of hydrogen ion-oxygen ionhybrid wave. This event is correlated in time with the observations ofthe sharp increase of the ratio of oxygen ion density to hydrogen andwith the electronenergization along the magnetic field. A theoretical model on theion-ion hybrid wave excited by an energetic electron beam has also beenpresented. It is found that the ion-ion hybrid wave is mainlyexcited by the Cherenkov instability in the auroral region.
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