Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/10559
AuthorsMikhailov, Andrey* 
Perrone, Loredana* 
TitleThermospheric parameters long-term variations retrieved from ionospheric observations in Europe
Issue Date28-Nov-2016
Series/Report no./121 (2016)
DOI10.1002/2016JA023234
URIhttp://hdl.handle.net/2122/10559
KeywordsTo retrieve neutral composition, temperature, and the total solar EUV flux at three ionosonde stations
Subject ClassificationLong.term trend in the thermosphere
AbstractRecently developed method to retrieve thermospheric parameters (Tex, O, O2, and N2) and the total solar EUV flux with λ<1050 Å from routine foF1 ionosonde observations has been applied to monthly median foF1 data on Rome, Slough/Chilton, and Juliusruh stations to analyze long-term trends in the thermospheric parameters. For the first time exospheric temperature and neutral composition were obtained for June noontime conditions over the period of ~ 5 solar cycles. The retrieved parameter manifested solar cycle and long-term (some solar cycles) variations with a rising phase in 1965–1985 and falling phase in 1985–2008. The retrieved thermospheric parameters were shown to be close to the MSIS-86 model ones exhibiting very small (<1% per decade) and statistically insignificant linear trends estimated either over all 56 years or only over the years of solar minimum. No peculiarities in long-term variations in relation with the last deep solar minimum have been revealed. The source of the thermospheric parameter long-term trends is the Sun, i.e., they have a natural (not anthropogenic) origin and are mainly controlled by long-term variations of solar and geomagnetic activity.
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