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- W1970174795 abstract "Abstract The method developed and tested by the author earlier was applied to a detailed analysis of the h m F2 data obtained at the network of ionospheric stations to reveal long-term trends independent of the geomagnetic activity variations during the recent decades (nongeomagnetic trends). Unlike the results on f oF2 published by the author earlier, the picture of h m F2 trends is not homogeneous. For 17 ionospheric stations positive significant trends are obtained. Six stations give negative trends in h m F2. For three stations no trends were derived. The comparison of the trends in f o F2 to the trends in the thermospheric density derived from satellite drag data shows their mutual agreement in the scope of current F-region theory. They also agree to the trends predicted in the 1990s for the CO 2 doubling. However, since the doubling has not yet happened, one has to look for other processes responsible for the trends. There is a possibility that the trends in thermospheric density and f o F2 may be of an anthropogenic origin. A hypothesis is considered according to which both these trends may be due to a decrease (negative trend) of the O concentration in the thermosphere. To relate this assumption to other trends the behavior of the E-layer parameters is considered. It is shown that positive trends in f o E are consistent with the negative trends of the [ NO + ] / [ O 2 + ] ratio, the latter being governed by the amount of NO. If there is a negative trend in [NO] in the E region during the recent decades, it is most probably due to the intensification (positive trend) of the eddy diffusion. This intensification should inevitably lead to a decrease of [O] in the entire atmospheric column above the E region. Such decrease may be responsible for the density depletion at satellite heights and f o F2 depletion in the F2-layer." @default.
- W1970174795 created "2016-06-24" @default.
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- W1970174795 date "2005-01-01" @default.
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- W1970174795 title "Long-term trends in F2-layer parameters and their relation to other trends" @default.
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- W1970174795 doi "https://doi.org/10.1016/j.asr.2005.02.051" @default.
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