High-frequency electron-cyclotron fluctuations in an active ionospheric plasma experiment are considered. It is shown that high-frequency (HF) electron-cyclotron waves in the region of an expanding plasma is a consequence of prolonged existence of warm electrons or disturbed electron distribution in jet.
The experimental data of active ionosphere experiment “North-star” are revisited.During the experiment, the plasma jet was injected into the ionosphere plasma transverse to geomagnetic field. A prolonged glow of the plasma cloud was observed. Anomalous ionization, low frequency waves and plasma heating were detected. The asymmetric azimuthal distribution of superthermal electrons indicates the presence of an intense transverse DC electric field. A change in the dynamics of a plasma jet under the influence of this factor is considered in this paper. The external DC electric field and electrostatic ion-cyclotron drift waves on density/temperature gradient along the transverse DC electric field play a role in plasma heating.
In the active ionosphere geophysical experiment "North Star" by injection of a high-speed plasma jet, luminescence of the excited components of the surrounding air was observed. In this paper, two possible sources of excitation of this luminescence are considered: streams of super-thermal electrons accelerated at the jet front and streams of precipitating electrons, the precipitation of which is triggered by jet injection. Detailed analysis of experimental data allows us to separate these two sources of super-thermal electrons. The origin of electrons forming at the front of an expanding plasma jet is associated with nonlinear processes in this area and will be discussed in detail in subsequent publications. This paper analyzes the mechanisms of electron precipitation from the upper ionosphere.
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