The dynamics of large-scale absorption variations (fmin) at Irkutsk

Victor D. Kokourov; Eduard S. Kazimirovsky; Galina V. Vergasova

doi:10.1117/12.548661

23 February 2004 The dynamics of large-scale absorption variations (f_min) at Irkutsk

Victor D. Kokourov, Eduard S. Kazimirovsky, Galina V. Vergasova

Proceedings Volume 5397, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics; (2004) https://doi.org/10.1117/12.548661
Event: Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2003, Tomsk, Russian Federation

Abstract

For the first time, using long-term f_min 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_min) 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_min 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_min under investigation which characterize its long-term variability, may serve as climatic characteristics for the description of this atmospheric region.

Citation Download Citation

Victor D. Kokourov, Eduard S. Kazimirovsky, and Galina V. Vergasova "The dynamics of large-scale absorption variations (f_min) at Irkutsk", Proc. SPIE 5397, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics, (23 February 2004); https://doi.org/10.1117/12.548661

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