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Reconstruction of average air temperatures for the last millenium
Střeštík, Jaroslav
2003 - Czech
The air temperature increase during the last century can be explained either by the enhanced green-house effect or by the regular long-term variations. These two explanations give two different forecasts as to the future climate. Reconstructed temperature series which guess the climate many centuries ago help to distinguish which model is more probable. Průběh globálních teplot ukazuje neustálý růst, který je dáván do souvislosti se zvýšeným skleníkovým efektem vlivem rostoucí koncentrace CO2 v atmosféře. Vliv koncentrace CO2 na teplotu vzduchu je doložen i výpočty. Protože tato koncentrace poroste i nadále, předpokládá se další růst průměrné teploty vzduchu.
Keywords:
average air temperatures; last millenium; reconstructed temperature
Available at various institutes of the ASCR
Reconstruction of average air temperatures for the last millenium
The air temperature increase during the last century can be explained either by the enhanced green-house effect or by the regular long-term variations. These two explanations give two different ...
The occurrence of warm and cold days during two centuries in Prague-Klementinum
Střeštík, Jaroslav
2003 - Czech
On the basis of observations in Prague-Klementinum since 1775 the course of the average daily air temperature in summer and winter season has been presented. In the same way the course of maximal temperatures in the day and minimal temperatures in the night, separately for summer and winter, are also given. Je uveden průběh průměrných ročních teplot v pražském Klementinu za celou dobu pozorování, průběh průměrných letních teplot a průměrných zimních teplot. Stejně je uveden průběh maximálních denních teplot a minimálních nočních teplot, odděleně pro letní a zimní období.
Keywords:
average daily temperature; observations; Prague-Klementinum
Available at various institutes of the ASCR
The occurrence of warm and cold days during two centuries in Prague-Klementinum
On the basis of observations in Prague-Klementinum since 1775 the course of the average daily air temperature in summer and winter season has been presented. In the same way the course of maximal ...
Transits of inner planets across the solar disc
Střeštík, Jaroslav
2003 - Czech
In rare occasions an inner planet can be located just between the Sun and the Earth for a short time. In these cases the transit of the planet across the solar disk is being observed on the Earth. More interesting but more rare are transits of Venus because the Sun rays shine through the atmosphere of the planet. In the paper is described how these transits look and how can be observed. Při úplném zatmění Slunce se Měsíc nachází přesně mezi Zemí a Sluncem, takže tato tři tělesa leží v přímce. Tak se občas může do podobné polohy dostat vnitřní planeta, tedy Merkur nebo Venuše. Na Zemi pak pozorujeme přechod této planety přes sluneční disk. Celý jev je obvykle viditelný pouze v dalekohledu vybaveném dostatečným filtrem na pozorování slunečních skvrn.
Keywords:
solar disc; transits; inner planets
Available at various institutes of the ASCR
Transits of inner planets across the solar disc
In rare occasions an inner planet can be located just between the Sun and the Earth for a short time. In these cases the transit of the planet across the solar disk is being observed on the Earth. ...
Twenty years of monitoring of the stability of the hazardous slopes of Krušné hory Mts. with precise tiltmeters
Chán, Bohumil
2003 - Czech
Twenty years ago the coal open pit mining in the North Bohemia under Krušné hory Mts. was started. To avoid possible accidents a complex system of monitoring in this area affected by mining was established. Před dvaceti lety byla zahájena těžba uhlí v severních Čechách pod Krušnými horami velkolomovou metodou. Aby se předešlo možné katastrofě, byl v této oblasti vybudován komplexní varovný systém.
Keywords:
coal mining; monitoring; The Ore Mountains
Available at various institutes of the ASCR
Twenty years of monitoring of the stability of the hazardous slopes of Krušné hory Mts. with precise tiltmeters
Twenty years ago the coal open pit mining in the North Bohemia under Krušné hory Mts. was started. To avoid possible accidents a complex system of monitoring in this area affected by mining was ...
Natural and artificial variations in the natality in Slovakia
Střeštík, Jaroslav; Mikulecký, M.; Žirko, M.
2003 - Czech
Daily numbers of births in Slovakia 1996-2001 were taken into calculations. In the annual variation a trough occurs from October to December, and short sharp minima during holidays. In the spectrum only annual and 7-day period supplemented by their higher harmonics can be found. No trace of lunar variation has been bound. Všechna data v této práci pocházejí ze Statistického úřadu Slovenské republiky. K dispozici máme denní počty narozených dětí na celém Slovensku v letech 1996 až 2001. Všechny zde nalezené variace kromě pravidelné roční vlny mají původ umělý, způsobený lidským faktorem. Nebyla nalezena žádná perioda odpovídající heliogefyzikálním jevům nebo související s polohou Měsíce.
Keywords:
natality; Slovakia; annual variations
Available at various institutes of the ASCR
Natural and artificial variations in the natality in Slovakia
Daily numbers of births in Slovakia 1996-2001 were taken into calculations. In the annual variation a trough occurs from October to December, and short sharp minima during holidays. In the spectrum ...
Analysis of the relation between geomagnetic activity and the phase of the North Atlantic Oscillation
Bochníček, Josef; Hejda, Pavel; Pýcha, Josef
2003 - Czech
The North Atlantic Oscillation is considered to be a very robust phenomenon. The analysis of tropospheric pressure and temperature deviations from their long-term averages realised on the data set of winter (January-March) periods 1963-2001, as well as wind deviations from their long-term averages pointed at close association between high geomagnetic activity and the positive NAO phase. Přestože severoatlantická oscilace (NAO) bývá považována za robustní meteorologický fenomén, analýza tlakových a teplotních troposférických polí v zimních obdobích (leden-březen) let 1963-2001, spolu s analýzou převládajících větrů vanoucích v troposféře v zimních obdobích let 1964, 1967-1969, 1971-2001 ukázala na neopominutelnou souvislost mezi úrovní geomagnetické aktivity a fází NAO.
Keywords:
geomagnetic activity; North Atlantic Oscillation; troposphere
Available at various institutes of the ASCR
Analysis of the relation between geomagnetic activity and the phase of the North Atlantic Oscillation
The North Atlantic Oscillation is considered to be a very robust phenomenon. The analysis of tropospheric pressure and temperature deviations from their long-term averages realised on the data set of ...
Variability of daily average air temperatures during the observation in Prague-Klementinum
Střeštík, Jaroslav
2002 - Czech
Two quantities have been defined to describe the variability of average daily air temperatures with respect to the long-term annual course within a selected interval: low values mean that daily values do not differ substantially from the long-term annual course whereas high values indicate a big variability. These values were calculated for each year and each season from 1775 till 2000. Jsou definovány dvě veličiny, které číselně popisují odchylky průměrných teplot vzduchu v jednotlivých dnech od dlouhodobého ročního chodu v průběhu určitého období: nízké hodnoty znamenají, že chod teploty v daném období je blízký dlouhodobému ročnímu chodu, vysoké hodnoty znamenají velké kolísání. Tyto hodnoty byly spočteny pro každý rok a každou sezonu od r. 1775 do r. 2000.
Keywords:
average air temperatures; variability; Prague-Klementinum
Available at various institutes of the ASCR
Variability of daily average air temperatures during the observation in Prague-Klementinum
Two quantities have been defined to describe the variability of average daily air temperatures with respect to the long-term annual course within a selected interval: low values mean that daily values ...
Lengths of grapewine sprouts, air temperatures and heliogeophysical factors from the point of view of chronobiology
Střeštík, Jaroslav; Mikulecký, M.
2002 - Czech
Series of sunspot numbers, indices of geomagnetic activity, mean air temperature in April and grapewine lengths measured to the 24th April were processed by power spectra and mutual coherences. Whereas spectra of sunspot numbers exhibit a pronounced peak at 11 yr, in spectra of other quantities more significant peaks occur. Řady Wolfových čísel slunečních skvrn, indexů geomagnetické aktivity, průměrných dubnových teplot vzduchu a délek letorostů vinné révy k 24. dubnu byly zpracovány metodou výpočtu powerspekter a vzájemných koherencí. Zatímco u Wolfových čísel dalece převládá perioda kolem 11 let, u dalších veličin je celá řada významných vrcholů ve spektru.
Keywords:
sunspot numbers; geomagnetic activity; grapewine lengths
Available at various institutes of the ASCR
Lengths of grapewine sprouts, air temperatures and heliogeophysical factors from the point of view of chronobiology
Series of sunspot numbers, indices of geomagnetic activity, mean air temperature in April and grapewine lengths measured to the 24th April were processed by power spectra and mutual coherences. ...
Solar and geomagnetic activity effects on wind fields in the Northern hemisphere winter lower troposhere
Bochníček, Josef; Hejda, Pavel
2002 - Czech
The magnitude and prevailing direction of winds in the lower troposphere were analysed in the Northern hemisphere in the winter periods of the years 1964, 1967-1969, 1971-2001. Composite maps of those winds showed marked differences, in particular between the maps in which both activities were simultaneously low or high. Byla vyšetřována souvislost mezi chováním sluneční a geomagnetické aktivity a chováním větrných polí dolní troposféry severní polokoule v průběhu zimních období let 1964, 1967-1969, 1971-2001. Souvislost byla analyzována prostřednictvím kompozitních map větrných polí. Ukázalo se, že tyto mapy, v nichž jsou obě aktivity současně nízké nebo vysoké, vykazují největší vzájemné rozdíly.
Keywords:
solar activity; geomagnetic activity; lower troposhere
Available at various institutes of the ASCR
Solar and geomagnetic activity effects on wind fields in the Northern hemisphere winter lower troposhere
The magnitude and prevailing direction of winds in the lower troposphere were analysed in the Northern hemisphere in the winter periods of the years 1964, 1967-1969, 1971-2001. Composite maps of those ...
Interactive demonstration of the effect of causal and acausal frequency filtering on seismic signals
Plešinger, Axel; Kolář, Petr
2002 - English
Causal and acausal filtering are procedures routinely used in the processing of seismic and other non-stationary signals but many users of respective software tools are not aware of the apparently subtle, for the exact interpretation of the filtered signals however significant differences between the two methods.
Keywords:
seismic signals; broadband seismograms; digital signal processing; waveform seismograms
Available at various institutes of the ASCR
Interactive demonstration of the effect of causal and acausal frequency filtering on seismic signals
Causal and acausal filtering are procedures routinely used in the processing of seismic and other non-stationary signals but many users of respective software tools are not aware of the apparently ...
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