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- W1993756471 abstract "While monitoring the environment it is quite important to take into account the impact of quasi-periodical variations of external factors and process. To understand the palings of geophysical processes we should take into consideration the variation of geoeffective solar radiation both during the main 11-year solar cycle and during smaller-period minor solar cycles. For investigating the quasi-biennial variations, the usual spectral analysis is less effective than suitable filtration. Statistical estimates of variances of the periods of quasi- biennial variations (QBV) in a long series of observations have shown that these QBV are caused not by the process of filtration as it can be while analyzing a sequence of random sampling numbers. And furthermore, the analysis the QBV of several solar and geophysical parameters during the solar cycle N 21 shows that the moments of main minima and maxima of oscillations of all parameters under study nearly coincide. Therefore, we may consider that QBV in ionosphere and geomagnetic fluctuations. Thus, the study of QBV serves as an effective means of revealing the solar activity effects in geophysical processes. Similar researches should be continued while analyzing the results of global monitoring of other environmental parameters.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only." @default.
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- W1993756471 date "1993-11-12" @default.
- W1993756471 modified "2023-09-23" @default.
- W1993756471 title "<title>Quasi-biennial variations in solar activity and geophysical processes</title>" @default.
- W1993756471 doi "https://doi.org/10.1117/12.162192" @default.
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