Peculiarities of Excitation of Large-Scale Plasma Density Irregularities During Modification of the Ionospheric F 2 Region by High-Power HF Radio Waves

Abstract

We present the experimental results concerning the features of large-scale artificial plasma-density irregularities excited in the ionospheric F 2 region by high-power HF radio waves. The experiments were performed in recent years using the SURA heating facility. It is shown that at the altitude of the pump-wave reflection, these irregularities are most efficiently generated in the magnetic zenith region. The effect of enhancement of the large-scale irregularity generation at the edge of the pump-wave beam is revealed. The results of studying large-scale irregularities recorded at the altitudes of the topside ionosphere are presented. Experimental results concerning the features of the internal gravity waves generated at the ionospheric altitudes during periodic heating of the ionospheric plasma by high-power HF radio waves are summarized and their possible influence on generation of artificial ionospheric irregularities at a long distance from the heater is discussed.

Statistical Characteristics of the Temporal Spectrum of Scattered Radiation in the Equatorial Ionosphere

“…Experimental measurements of artificial largescale electron density inhomogeneities generation in the ionospheric F 2 region by "SURA" heating facility by powerful radio waves were given in the study by Frolov et al [17] . Transverse scale of these irregularities l ⊥ varies from a few meters up to tens of a hundred kilometers.…”