Long-term trends in the total electron content
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F17%3A00478482" target="_blank" >RIV/68378289:_____/17:00478482 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1002/2017GL075063" target="_blank" >http://dx.doi.org/10.1002/2017GL075063</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1002/2017GL075063" target="_blank" >10.1002/2017GL075063</a>
Alternative languages
Result language
angličtina
Original language name
Long-term trends in the total electron content
Original language description
The total electron content (TEC) is important among others for Global Navigation SatellitenSystems/GPS signal propagation and applications. However, there is only one comprehensive analysis of TEC trends, and the resulted trends are not consistent with trends in other ionospheric parameters. Here we use the TEC data of Lean et al. (2011) and the JPL35 homogeneous TEC data series derived by Emmert et al. (2017). This analysis results in three main conclusions: (1) Too positive TEC trends by Lean et al. (2011) are caused by data problems in 1995–2001, particularly by too low Center for Orbit Determination data. (2) TEC reveals a weak negative trend at the edge of reliability, no trend or trend break is also possible, longer data series than 1994–2015 is required. (3) About 99% of the total variance of yearly average global TEC values is explained by variability of solar activity.nnPlain Language Summary The total electron content (TEC) is a number of free electrons in unit column throughout the ionosphere. It is important as global ionospheric characteristic and also for the GPS signal propagation and applications to positioning. The ionosphere is changing on long-term scale mainly due to the increasing concentration of greenhouse gases in the atmosphere. However, there is only one comprehensive analysis of TEC trends, and the resulted trends are not consistent with trends in other ionospheric parameters. Our analysis shows that (1) too positive TEC trends by Lean et al. (2011) are caused by data problems in 1995-2001, which were not known in 2011. (2) TEC reveals a weak negative trend at the edge of reliability, not a positive trend.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10510 - Climatic research
Result continuities
Project
<a href="/en/project/GA15-03909S" target="_blank" >GA15-03909S: Scenario of long-term trends in the stratosphere-mesosphere-thermosphere-ionosphere system</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Geophysical Research Letters
ISSN
0094-8276
e-ISSN
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Volume of the periodical
44
Issue of the periodical within the volume
16
Country of publishing house
US - UNITED STATES
Number of pages
5
Pages from-to
8186-8172
UT code for WoS article
000410658800009
EID of the result in the Scopus database
2-s2.0-85028333353