About: High historical values of foEs

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://www.sciencedirect.com/science/article/pii/S1364682611002811
Description	Very high values of foEs had sometimes been reported in the past. These values had been derived from ionograms under the assumption of vertical reflection of ordinary mode of sounding radio waves. Modern digisondes make possible to test this assumption. All hourly values of foEs > 6.0 MHz for seven summers (June 2004–August 2010) from a midlatitude station Pruhonice are selected for test, altogether 282 values. In 90% of cases the classical’’ way of evaluation of foEs provides values higher than true’’ values from modern digisonde (average difference about 1 MHz). 38% of classical’’ foEs are oblique reflections, which however do not occur in direction perpendicular to geomagnetic field. The occurrence of high values of foEs varies very much from year to year between 0 and 130 events per summer. As for diurnal variation, a pronounced maximum occurs at 10:00LT and 16:00LT (secondary), and a minimum after midnight. Very high values of foEs had sometimes been reported in the past. These values had been derived from ionograms under the assumption of vertical reflection of ordinary mode of sounding radio waves. Modern digisondes make possible to test this assumption. All hourly values of foEs > 6.0 MHz for seven summers (June 2004–August 2010) from a midlatitude station Pruhonice are selected for test, altogether 282 values. In 90% of cases the classical’’ way of evaluation of foEs provides values higher than true’’ values from modern digisonde (average difference about 1 MHz). 38% of classical’’ foEs are oblique reflections, which however do not occur in direction perpendicular to geomagnetic field. The occurrence of high values of foEs varies very much from year to year between 0 and 130 events per summer. As for diurnal variation, a pronounced maximum occurs at 10:00LT and 16:00LT (secondary), and a minimum after midnight. (en)
Title	High historical values of foEs — Reality or artefact? High historical values of foEs — Reality or artefact? (en)
skos:prefLabel	High historical values of foEs — Reality or artefact? High historical values of foEs — Reality or artefact? (en)
skos:notation	RIV/68378289:_____/12:00370487!RIV12-AV0-68378289
http://linked.open...avai/predkladatel	Ústav fyziky atmosféry AV ČR v. v. i. .
http://linked.open...avai/riv/aktivita	P Z
http://linked.open...avai/riv/aktivity	P(IAA300420704), P(KJB300420904), P(OC09009), Z(AV0Z30420517)
http://linked.open...iv/cisloPeriodika	-
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Burešová, Dalia Kouba, Daniel Laštovička, Jan Boška, Josef
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyziky atmosféry AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	138930
http://linked.open...ai/riv/idVysledku	RIV/68378289:_____/12:00370487
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Ionosphere; Sporadic-E layer; Ionospheric measurements (en)
http://linked.open.../riv/klicoveSlovo	Ionosphere Ionospheric measurements Sporadic-E layer
http://linked.open...odStatuVydavatele	GB - Spojené království Velké Británie a Severního Irska
http://linked.open...ontrolniKodProRIV	[BE8DCFAC87FD]
http://linked.open...i/riv/nazevZdroje	Journal of Atmospheric and Solar-Terrestrial Physics
http://linked.open...in/vavai/riv/obor	DG
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Height-dependence of ionospheric drifts in region 90-150 km Space weather and climate in the ionosphere over Europe - COST ES0803. Sporadic E layer variability
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	74
http://linked.open...iv/tvurceVysledku	Burešová, Dalia Kouba, Daniel Laštovička, Jan Boška, Josef
http://linked.open...ain/vavai/riv/wos	000301612000005
http://linked.open...n/vavai/riv/zamer	Studium atmosférického obalu Země v interakci s pozemskými a kosmickými vlivy
issn	1364-6826
number of pages	4 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.jastp.2011.10.008
is http://linked.open...avai/riv/vysledek of	High historical values of foEs — Reality or artefact?

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