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http://hdl.handle.net/2122/10615
Authors: | Perrone, Loredana* Mikhailov, A.* Cesaroni, Claudio* Alfonsi, Lucilla* De Santis, Angelo* Pezzopane, Michael* Scotto, Carlo* |
Title: | Long-term variations of the upper atmosphere parameters on Rome ionosonde observations and their interpretation | Journal: | Journal of Space Weather and Space Climate | Series/Report no.: | /7(2017) | Issue Date: | 27-Sep-2017 | DOI: | 10.1051/swsc/2017021 | Keywords: | long-term trend ionosphere thermosphere |
Subject Classification: | 01.02. Ionosphere | Abstract: | A recently proposed self-consistent approach to the analysis of thermospheric and ionospheric long-term trends has been applied to Rome ionosonde summer noontime observations for the (1957–2015) period. This approach includes: (i) a method to extract ionospheric parameter long-term variations; (ii) a method to retrieve from observed foF1 neutral composition (O, O2, N2), exospheric temperature, Tex and the total solar EUV flux with λ<1050 Å; and (iii) a combined analysis of the ionospheric and thermospheric parameter long-term variations using the theory of ionospheric F-layer formation. Atomic oxygen, [O] and [O]/[N2] ratio control foF1 and foF2 while neutral temperature, Tex controls hmF2 long-term variations. Noontime foF2 and foF1 long-term variations demonstrate a negative linear trend estimated over the (1962–2010) period which is mainly due to atomic oxygen decrease after ∼1990. A linear trend in (δhmF2)11y estimated over the (1962–2010) period is very small and insignificant reflecting the absence of any significant trend in neutral temperature. The retrieved neutral gas density, ρ atomic oxygen, [O] and exospheric temperature, Tex long-term variations are controlled by solar and geomagnetic activity, i.e. they have a natural origin. The residual trends estimated over the period of ∼5 solar cycles (1957–2015) are very small (<0.5% per decade) and statistically. |
Appears in Collections: | Article published / in press |
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2017_JournalSpaceWeatherSpaceClimate_long_term_trend.pdf | full paper | 1.06 MB | Adobe PDF | View/Open |
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