Aperiodic Large-Scale Disturbances in the Lower Ionosphere. Ionosonde Observation Results

Observations of the Ionospheric Wave Disturbances Using the Kharkov Incoherent Scatter Radar upon RF Heating of the Near-Earth Plasma

“…Note that on August 28-30, 2012 the electron density bursts after the heater switch-on in the [+30 min; −30 min] regime were also observed using a network of ionosondes [26,27]. The ionosondes were 560 to 2200 km away from the heater.…”

“…Such aperiodic bursts of the δ P variation of the scattered radiation power, and therefore of the electron number density, can be caused by bursts of ionization as a result of the impact on the ionospheremagnetosphere-atmosphere-ionosphere system [13,[25][26][27]. The probable mechanisms of interaction between subsystems in the mentioned system can be the following.…”

“…The probable mechanisms of interaction between subsystems in the mentioned system can be the following. Long-term (30 min) continuous radiation disturbs the ionospheric plasma (both inside and outside the antenna pattern) and also leads to the electromagnetic disturbance generation [13,[25][26][27]. After the heater switch-off, primary parameters of the plasma (temperature T e , electron number density N , etc.…”

Geomagnetic Pulsation Amplitude and Spectrum Variations Accompanying the Ionospheric Heating by High-Power Radio waves from the Sura Facility

“…The increase in N , most probably, was caused by the precipitation of particles from the inner radiation belt. This assumption is favored by the synchronous observations [12,13] performed with a network of ionosondes in the same days. Such a mechanism of interaction in the Earth-atmosphereionosphere-magnetosphere system apparently took place in the experiments too [11].…”

“…The first of them, aperiodic, are caused by the increased electron number density N at the altitudes of the ionospheric D and E regions, which is due most probably to the precipitation of energetic electrons (with 40-100 keV energies) from the Earth's inner radiation belt [7][8][9][10][11][12][13]. The second, quasiperiodic disturbances are related with the generation (amplification) and propagation of acoustic-gravity waves with the period T ≈ 1-60 min in the upper atmosphere of the Earth and modulation of the electron number density [7,8,[14][15][16][17][18][19][20].…”