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Трехмерная модель формирования мелкомасштабных каверн плотности в области авроральных продольных токов
A 3D problem of the formation of smallscale density caverns with a nonstationary electric field
in the region of auroral electric currents and kinetic Alfvén wave currents is considered. It is shown that an
excess of the electron current velocity over a certain critical value of their thermal velocity is a probable cause
of cavern formation. Linear and nonlinear stages of the density cavern formation are considered, and their
main parameters are estimated. In the case of comparatively strong magnetic fields, caverns can be formed
with comparable longitudinal and transverse (with respect to the magnetic field) scales. The properties of
parameters of smallscale density caverns and nonstationary electric field agree with wellknown experimen
tal data