The influence of electron density gradient direction on gradient-drift instabilities in the E-layer of the ionosphere

摘要: We show that the dispersion relation for gradient-drift and Farley-Buneman instabilities within approximation of two-fluid MHD should contain terms which are traditionally supposed to be small. These caused by taking into account divergence particles velocity electron density gradient along magnetic field direction. It is shown at heights below 115km solution transforms standard one, except situations, when parallel or wave-vector. In these cases neglected summands growth rate irregularities becomes significant. The additional depend on relative directions gradient, mean velocities. This leads different instability conditions equatorial high-latitude regions ionosphere. obtained results do not contradict with experimental data.