Počet záznamů: 1

Long-term trends in the total electron content

SYSNO ASEP	0478482
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Long-term trends in the total electron content
Tvůrce(i)	Laštovička, Jan (UFA-U)_{RID, ORCID} Urbář, Jaroslav (UFA-U)_{RID, ORCID} Kozubek, Michal (UFA-U)_{RID, ORCID}
Celkový počet autorů	3
Zdroj.dok.	Geophysical Research Letters. - : Wiley - ISSN 0094-8276 Roč. 44, č. 16 (2017), s. 8186-8172
Poč.str.	5 s.
Forma vydání	Tištěná - P
Jazyk dok.	eng - angličtina
Země vyd.	US - Spojené státy americké
Klíč. slova	total electron content ; long-term trend ; solar control
Vědní obor RIV	DG - Vědy o atmosféře, meteorologie
Obor OECD	Climatic research
CEP	GA15-03909S GA ČR - Grantová agentura ČR
Institucionální podpora	UFA-U - RVO:68378289
UT WOS	000410658800009
EID SCOPUS	85028333353
DOI	10.1002/2017GL075063
Anotace	The total electron content (TEC) is important among others for Global Navigation Satellite Systems/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. Plain 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.
Pracoviště	Ústav fyziky atmosféry
Kontakt	Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019
Rok sběru	2018

Počet záznamů: 1