Are trends in total electron content (TEC) really positive?

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F13%3A00394691" target="_blank" >RIV/68378289:_____/13:00394691 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1002/jgra.50261" target="_blank" >http://dx.doi.org/10.1002/jgra.50261</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/jgra.50261" target="_blank" >10.1002/jgra.50261</a>

Result language
angličtina
Original language name
Are trends in total electron content (TEC) really positive?
Original language description
The total electron content (TEC) is a primary ionospheric parameter as it can be studied globally using signals of GNSS satellites. Lean et al. (2011, JGR) in the first study of long-term trends in TEC found positive trends for the period 1995?2010 basedon TEC derived from global GPS observations. However, the positive trends seem to be inconsistent with both observed and modeled trends in foF2. Here we try to shed light on this puzzle using historical Faraday rotation TEC measurements and foF2 data over the period 1995?2010. We use data from European area where Lean et al. (2011) report remarkably stronger than average positive trend of TEC. These data suggest no trend of TEC in this region in the past but also almost no trend of foF2 over 1995?2010compared with a negative trend in solar cycles 21 and 22. This means that the trends for 1995?2010 are more positive than trends for the period 1976?1996 and that the trends for 1995?2010 are not representative for the previous period. Th
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DG - Atmospheric sciences, meteorology
OECD FORD branch
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Project
<a href="/en/project/GAP209%2F10%2F1792" target="_blank" >GAP209/10/1792: Long-term changes in the atmosphere-ionosphere system</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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