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- W2893428675 abstract "LAbstractPerroneadjusted. Unfortunately required long-term reliable hmF2 observations are absent. A new method has been proposed to solve this problem using available monthly median foF1 and foF2 ground-based ionosonde observations. Such manually scaled observations are available on European stations for a period of 5 solar cycles. Summer (June) daytime foF1 observations are used to retrieve: exospheric temperature Tex, neutral composition ([O], [O 2 ], [N 2 ]) and the total solar EUV flux with $lambda . Fitting with vertical plasma drift W (the only unknown parameter) calculated foF2 to the observed one the height of F2-layer maximum, hmF2 may be found. Such calculations have been done using Sodankyla and Juliusruh foF1 and foF2 observations for the (1958–2017) period. Two methods were used to remove solar and geomagnetic activity effects from the retrieved hmF2 long-term variations: i) by a normalization with the Shubin hmF2 monthly median model and b) using a regression with an $index=F_{10.7}^{alpha}+Ap^{beta}$ , where $alpha$ and $beta$ are fitted parameters. Both methods give negative statistically significant (at 99% confidence level) trends hmF2 but with different magnitudes: ∼ 0.7% per decade at Juliusruh and ∼ 2% per decade at Sodankyla. Over four decades (the period of cooling due to the CO 2 concentration increase) this gives a decrease in hmF2 of ∼ 8 km at Juliusruh and ∼ 25 km at Sodankyla. Both estimates are larger than expected under a 20% increase in the CO 2 abundance. Possible mechanisms are discussed." @default.
- W2893428675 created "2018-10-05" @default.
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- W2893428675 date "2018-05-01" @default.
- W2893428675 modified "2023-10-02" @default.
- W2893428675 title "Summer Noontime h<inf>m</inf>F<inf>2</inf> Long-Term Trends Inferred from f<inf>o</inf>F<inf>1</inf> and f<inf>o</inf>F<inf>2</inf> Ionosonde Observations in Europe" @default.
- W2893428675 doi "https://doi.org/10.23919/ursi-at-rasc.2018.8471332" @default.
- W2893428675 hasPublicationYear "2018" @default.
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