A Study of the Density Variations of Mesospheric Ozone in the Case of Ionospheric Perturbation by The “Sura” Facility Radiation with Simultaneous Diagnostics of Ionospheric Plasma

HF-Induced Artificial Injection of Energetic Electrons from the Earth’s Radiation Belt as a Powerful Source for Modification of Ionized and Neutral Components of the Earth’s Atmosphere

“…When interpreting the observed decrease in the ozone line radiation intensity, it should be taken into account that the extremely low concentration of electrons in the D region compared to the concentration of neutrals (the degree of ionization here is ~10 −9 ) virtually eliminates the possibility of a direct influence of electron temperature rise in the The results of the measurements made it possible to conclude that (a) heating of the ionosphere leads to a noticeable decrease in the ozone emission intensity at small frequency shifts (|∆f | ≤ 40 MHz) relative to the center frequency of the ozone line, whereby a smaller detuning value led to a greater decrease, (b) the decrease in the integrated intensity of microwave emissions in the ozone line, averaged over all measurement sessions, was ~10% (18% for the session shown in Figure 5), (c) the times of the decrease in the intensity of the microwave emissions after PW turn on and their recovery after the end of ionosphere pumping were much shorter than 15 min, and (d) this effect was observed not only in the HF-modified region of the mesosphere (in its PW-illuminated region), but also at a distance of ~110 km south of it [75]. It was also found in [75] that, when a powerful HF radio wave acted on the lower ionosphere, an increase in the intensity of electron density irregularities and a general increase AIT were observed starting from ~55 km heights, indicating the development of strong perturbations in the ionospheric plasma during such experiments.…”