12 November 1993 Quasi-biennial variations in solar activity and geophysical processes
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Proceedings Volume 2107, CIS Selected Papers: Optical Monitoring of the Environment; (1993) https://doi.org/10.1117/12.162192
Event: Optical Monitoring of the Environment: CIS Selected Papers, 1993, Moscow, Russian Federation
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.
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G. S. Ivanov-Kholodny, V. E. Chertoprud, "Quasi-biennial variations in solar activity and geophysical processes", Proc. SPIE 2107, CIS Selected Papers: Optical Monitoring of the Environment, (12 November 1993); doi: 10.1117/12.162192; https://doi.org/10.1117/12.162192

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