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- W2019912524 abstract "For the first time, using long-term f<sub>min</sub> measurements acquired by the method of standard vertical-incidence radio incidence at st. Irkutsk (52° N, 105° E) for the time interval 1983-1991, we investigated the dynamics of large-scale variations of the minimum reflection frequency (f<sub>min</sub>) of radio waves from the ionosphere. Sliding multiple correloperiodogram analysis was used. We detected regular seasonal (91 days) and 27-day oscillations with almost constant periods, the semi-annual wave characterized by a period fluctuating over a rather wide range (176-221 days), and the annual wave with the mean period of 365 days. A clearly pronounced annual trend of seasonal df<sub>min</sub> fluctuations was observed. Quasi-biennial variations may be classed as irregular fluctuations with a constantly varying period over a rather wide range (588-886 days). The large-scale variations of f<sub>min</sub> under investigation which characterize its long-term variability, may serve as climatic characteristics for the description of this atmospheric region." @default.
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- W2019912524 date "2004-02-23" @default.
- W2019912524 modified "2023-09-23" @default.
- W2019912524 title "<title>The dynamics of large-scale absorption variations (f<formula><inf><roman>min</roman></inf></formula>) at Irkutsk</title>" @default.
- W2019912524 doi "https://doi.org/10.1117/12.548661" @default.
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