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Proceedings Paper

The dynamics of large-scale absorption variations (fmin) at Irkutsk
Author(s): Victor D. Kokourov; Eduard S. Kazimirovsky; Galina V. Vergasova
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Paper Abstract

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

Paper Details

Date Published: 23 February 2004
PDF: 5 pages
Proc. SPIE 5397, Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics, (23 February 2004); doi: 10.1117/12.548661
Show Author Affiliations
Victor D. Kokourov, Institute of Solar-Terrestrial Physics (Russia)
Eduard S. Kazimirovsky, Institute of Solar-Terrestrial Physics (Russia)
Galina V. Vergasova, Institute of Solar-Terrestrial Physics (Russia)


Published in SPIE Proceedings Vol. 5397:
Tenth Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Part II: Laser Sensing and Atmospheric Physics
Gennadii G. Matvienko; Georgii M. Krekov, Editor(s)

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