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- W2074927097 abstract "Abstract. A detailed analysis of the f oF2 data at the Sverdlovsk station is performed to answer the question: whether the long-term trends of the F2-layer parameter detected recently are mainly due to the long-term changes in geomagnetic activity during the recent decades. Two methods to derive trends independent of geomagnetic activity are developed. It is found that both methods agree well and give a relative nongeomagnetic trend of about - 0.0015 per year (or an absolute nongeomagnetic trend of about - 0.015 MHz per year). The close relation of foF2 to Ap found by several authors is mainly due to a high correlation between the foF2 deviations from the regression line and year-to-year changes in the Ap index rather than to systematic long-term changes of Ap as has been suggested earlier.Key words. Ionosphere (ionospheric distances; modeling and forecasting)" @default.
- W2074927097 created "2016-06-24" @default.
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- W2074927097 date "2002-04-30" @default.
- W2074927097 modified "2023-10-01" @default.
- W2074927097 title "The method of determination of the long-term trends in the F2 region independent of geomagnetic activity" @default.
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- W2074927097 doi "https://doi.org/10.5194/angeo-20-511-2002" @default.
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