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Characterization of Artificial, Small-Scale, Ionospheric Irregularities in the High-Latitude F Region Induced by High-Power, High-Frequency Radio Waves of Extraordinary Polarization
Ist Teil von
Geomagnetism and Aeronomy, 2019-11, Vol.59 (6), p.713-725
Ort / Verlag
Moscow: Pleiades Publishing
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The results of experimental studies of characteristics of artificial, small-scale, ionospheric irregularities in the high-latitude ionospheric
F
region caused by the controlled injection of high-power, high-frequency (HF) radio waves of extraordinary polarization (X mode) are presented. The experiments were carried out at the HF European Scientific Association (EISCAT)/Heating complex (Tromsø, northern Norway (69.6° N, 19.2° E)) in a wide range of heating frequencies (4–8 MHz) with an effective radiation power of 100 to 700 MW. It is shown that the generation of irregularities upon X heating occurs in the regular
F
region of the ionosphere under quiet magnetic conditions at heating frequencies both lower and higher than the critical frequency of the
F
2 layer. The rise and relaxation times of the irregularities, as well as the threshold powers of their excitation are determined. It is ascertained that the characteristics of irregularities upon X heating strongly depend on the heating frequency, the relationship between the heating frequency and the critical frequency of the
F
2 layer, and the conditions preceding the start of the heating cycle (“cold” start in the first X-heating cycle or subsequent X-heating cycles). The characteristics of irregularities upon exposure of the high-latitude ionospheric
F
region to high-power long radio waves of extraordinary (X mode) and ordinary (O mode) polarization are compared.