"1854;1870" . "Results of various authors on long-term trends in foF2, which is equivalent to the maximum electron density in the ionosphere, and their interpretation do not reveal a consistent pattern. Therefore a joint analysis of high-quality data of station Juliusruh (54.6oN, 13.4oE) at noon (average from 10-14 UT) for the period of two solar cycles from minimum to minimum (1976-1996) was performed by six teams, which used different approaches to trend determination. Various methods provide results, which differ to some extent. Another source of differences is application of various ways of removal (or at least large suppression) of the effect of solar (and geomagnetic) activity. Nevertheless finally most teams obtained quite comparable results. Interpretation of the observed trends is not unique \u2013 co-authors consider either the long-term change in geomagnetic activity, or anthropogenic effects to be predominantly responsible for trends."@en . . "17" . . "Long-term trends in foF2: A comparison of various methods" . . "Long-term trends in foF2: A comparison of various methods" . "1"^^ . "68" . "[45C23135AF65]" . "Elias, A. G." . "Z(AV0Z30420517)" . "La\u0161tovi\u010Dka, Jan" . "Long-term trends in foF2: A comparison of various methods"@en . "Dlouhodob\u00E9 trendy v foF2: srovn\u00E1n\u00ED r\u016Fzn\u00FDch metod"@cs . . "RIV/68378289:_____/06:00044746" . "11"^^ . . "Danilov, A. D." . . "Mikhailov, A. V." . . "Journal of Atmospheric and Solar-Terrestrial Physics" . "RIV/68378289:_____/06:00044746!RIV07-AV0-68378289" . "Ionosphere; foF2; Long-term trends; Anthropogenic effects"@en . "1364-6826" . . . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "Foppiano, A. J." . . "Results of various authors on long-term trends in foF2, which is equivalent to the maximum electron density in the ionosphere, and their interpretation do not reveal a consistent pattern. Therefore a joint analysis of high-quality data of station Juliusruh (54.6oN, 13.4oE) at noon (average from 10-14 UT) for the period of two solar cycles from minimum to minimum (1976-1996) was performed by six teams, which used different approaches to trend determination. Various methods provide results, which differ to some extent. Another source of differences is application of various ways of removal (or at least large suppression) of the effect of solar (and geomagnetic) activity. Nevertheless finally most teams obtained quite comparable results. Interpretation of the observed trends is not unique \u2013 co-authors consider either the long-term change in geomagnetic activity, or anthropogenic effects to be predominantly responsible for trends." . "V\u00FDsledky r\u016Fzn\u00FDch autor\u016F o dlouhodob\u00FDch trendech v foF2, je\u017E je ekvivalentn\u00ED maximu elektronov\u00E9 koncentrace v ionosf\u00E9\u0159e, i jejich interpretace ned\u00E1vaj\u00ED konsistentn\u00ED obraz. Proto \u0161est t\u00FDm\u016F provedlo spole\u010Dnou anal\u00FDzu kvalitn\u00EDch dat ze stanice Juliusruh (54.6oN, 13.4oE), poledne (pr\u016Fm\u011Br za 10-14 hod. UT) pro dva slune\u010Dn\u00ED cykly od minima k minimu (1976-1996) s pou\u017Eit\u00EDm r\u016Fzn\u00FDch metod ur\u010Dov\u00E1n\u00ED trend\u016F. R\u016Fzn\u00E9 metody poskytuj\u00ED v\u00FDsledky, kter\u00E9 se do jist\u00E9 m\u00EDry li\u0161\u00ED. Dal\u0161\u00EDm zdrojem rozd\u00EDl\u016F je pou\u017Eit\u00ED r\u016Fzn\u00FDch zp\u016Fsob\u016F odstran\u011Bn\u00ED \u010Di alespo\u0148 potla\u010Den\u00ED vliv\u016F slune\u010Dn\u00ED a geomagnetick\u00E9 aktivity. Nicm\u00E9n\u011B nakonec v\u011Bt\u0161ina t\u00FDm\u016F dostala zcela srovnateln\u00E9 v\u00FDsledky. Interpretace pozorovan\u00FDch trend\u016F nen\u00ED jednozna\u010Dn\u00E1 \u2013 spoluauto\u0159i pova\u017Euj\u00ED za dominantn\u00ED p\u0159\u00ED\u010Dinu pozorovan\u00FDch trend\u016F bu\u010F dlouhodob\u00E9 zm\u011Bny geomagnetick\u00E9 aktivity, nebo antropogenn\u00ED vlivy. Bylo odsouhlaseno n\u011Bkolik v\u00FDstup\u016F z t\u00E9to anal\u00FDzy: V\u0161echny trendy jsou z\u00E1porn\u00E9 nebo nev\u00FDznamn\u00E9."@cs . "Ulich, T." . "Jara, V." . "17"^^ . "Ovalle, E." . "Bremer, J." . . . . . "Long-term trends in foF2: A comparison of various methods"@en . "483627" . . "Ortiz de Adler, N." . "Abarca del Rio, R." . "Dlouhodob\u00E9 trendy v foF2: srovn\u00E1n\u00ED r\u016Fzn\u00FDch metod"@cs . .