No (136)
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High-frequency QPOs in GRO J1655-40
Bursa, Michal
2005 - English
We determine angular momentum from QPOs. Určujeme moment hybnosti pomocí studia QPO.
Keywords:
quasiperiodic oscillations
Available at various institutes of the ASCR
High-frequency QPOs in GRO J1655-40
We determine angular momentum from QPOs.
Určujeme moment hybnosti pomocí studia QPO.
Center for Earth Dynamics Research (CEDR) - results of five years of activity
Kostelecký, J.; Vondrák, Jan; Zeman, A.; Kalvoda, J.; Schenk, Vladimír
2005 - English
Five years of activities of the Center of Earth Dynamics Research is described. Jsou popsány aktivity Výzkumného centra dynamiky Země za posledních pět let.
Keywords:
geodynamics; geodesy
Available at various institutes of the ASCR
Center for Earth Dynamics Research (CEDR) - results of five years of activity
Five years of activities of the Center of Earth Dynamics Research is described.
Jsou popsány aktivity Výzkumného centra dynamiky Země za posledních pět let.
The relativistic shift of spectral lines from black-hole accretion discs
Pecháček, T.; Dovčiak, Michal; Karas, Vladimír
2005 - English
We study gravitational redshift of spectral lines. Studujeme gravitační posuv spektrálních čar.
Keywords:
accretion
Available at various institutes of the ASCR
The relativistic shift of spectral lines from black-hole accretion discs
We study gravitational redshift of spectral lines.
Studujeme gravitační posuv spektrálních čar.
Polarization of radiation from AGN accretion discs
Dovčiak, Michal; Karas, Vladimír; Matt, G.; Martocchia, A.
2005 - English
The effects of strong gravity on polarization are studied. Studujeme vliv silné gravitace na polarizaci záření.
Keywords:
polarization
Available at various institutes of the ASCR
Polarization of radiation from AGN accretion discs
The effects of strong gravity on polarization are studied.
Studujeme vliv silné gravitace na polarizaci záření.
Kinetic model of quasiperiodic oscillations of gaseous rings
Hadrava, Petr
2005 - English
In context of 3:2 resonant quasiperiodic oscillations, a method of "1+1/2 -dimensional" non-ideal gas dynamics is used to model axisymmetric oscillations of an orbiting ring. It is shown that the characteristic frequencies of the oscillations are influenced by the degree of freedom in the inner shear of the ring and by the rate of relaxation. Metoda "1+1/2 -dimensionalní" dynamiky neideálního plynu je užita k modelování orbitujícího disku v souvislosti s kvasiperiodickými oscilacemi v rezonanci 3:2. Je ukázáno, že charakteristické frekvence oscilací jsou ovlivněny vnitřním stupněm volnosti odpovídajícím smyku v prstenci a také mírou relaxace.
Keywords:
accretion disks; quasiperiodic oscillations
Available at various institutes of the ASCR
Kinetic model of quasiperiodic oscillations of gaseous rings
In context of 3:2 resonant quasiperiodic oscillations, a method of "1+1/2 -dimensional" non-ideal gas dynamics is used to model axisymmetric oscillations of an orbiting ring. It is shown that the ...
Experiences with the use of the local correlation tracking method when studying large-scale velocity fields
Švanda, Michal; Sobotka, Michal; Klvaňa, Miroslav
2005 - English
We verify the reliability of the method recently used for the calculation of the large-scale velocity fields on synthetic dopplergrams obtained by a very simple numerical simulation of the supergranular pattern. A series of synthetic dopplergrams was stretched by the known vector field and the LCT was applied. The results were compared with the original vector field. Applying the LCT method on synthetic data we got an important experience in the behaviour of this method when used on full-disc dopplergrams. On the basis of the described tests we assume that the use of LCT on full-disc dopplergrams provides sufficiently reliable results, so that method could be used for mapping the large-scale velocities with resolution 60" and an accuracy 10 m/s. V práci předkládáme testy metody použité v předchozích pracech pro výpočty velkorozměrových rychlostních polí na syntetických dopplergramech získaných jednoduchou simulací supergranulárních struktur. Série syntetických dopplergramů byla deformována známým vektorovým polem, na data byla posléze aplikována metoda LCT. Porovnáním získaných výsledků s modelovými daty jsme získali důležité informace o chování metody při použití na celodiskových dopplergramech. Na základě testů můžeme považoat LCT metodu za dostatečně stabilní při výpočtu rychlostních polí s rozlišením 60", přičemž absolutní chyba výsledků činí 10 m/s.
Keywords:
solar photosphere; velocity fields
Available at various institutes of the ASCR
Experiences with the use of the local correlation tracking method when studying large-scale velocity fields
We verify the reliability of the method recently used for the calculation of the large-scale velocity fields on synthetic dopplergrams obtained by a very simple numerical simulation of the ...
On polarization of light scattered on hot electron clouds
Horák, Jiří
2005 - English
We explore polarization of radiation of hot electron clouds. Studujeme polarizaci záření horkých elektronových oblaků.
Keywords:
polarization
Available at various institutes of the ASCR
On polarization of light scattered on hot electron clouds
We explore polarization of radiation of hot electron clouds.
Studujeme polarizaci záření horkých elektronových oblaků.
Accuracy assessment of gravity field models by independent satellite crossover altimetry
Klokočník, Jaroslav; Wagner, C. A.; Kostelecký, J.
2005 - English
A continuous progress in the Earth gravity field modeling requires some refinements in their accuracy assessments. The method based on latitude lumped coefficients, which makes use of satellite crossover altimetry data (independent of the tested gravity models) has been developed in years 1992 - 2000. It was applied on various gravity models, recently on EIGEN IS, which already includes data from the CHAMP mission. For the first time, EIGEN IS model has degree-dependent calibration factors and we tested and confirm that their choice is a right one. Přehled metod testování přesnosti v současné době publikovaných modelů tíhového pole Země pomocí diferenciální altimetrie s křížícími se body pro jednu a dvě družice.
Keywords:
GRIM5-S1
Available at various institutes of the ASCR
Accuracy assessment of gravity field models by independent satellite crossover altimetry
A continuous progress in the Earth gravity field modeling requires some refinements in their accuracy assessments. The method based on latitude lumped coefficients, which makes use of satellite ...
Six-year cycles of the Earth rotation and gravity
Chapanov, Y.; Vondrák, Jan; Gorshkov, V.; Ron, Cyril
2005 - English
Six-year cycles of pseudo-periodical oscillations are discovered in the series of astrometrical observations of the latitude and universal time, tidal observations and Earth rotation series. Jsou nalezeny šestileté cykly pseudo-periodických variací v astrometrickém pozorování šířky a světového času, slapových pozorováních a v sériích rotace Země.
Keywords:
Earth rotation; gravity
Available at various institutes of the ASCR
Six-year cycles of the Earth rotation and gravity
Six-year cycles of pseudo-periodical oscillations are discovered in the series of astrometrical observations of the latitude and universal time, tidal observations and Earth rotation series....
An introduction to relativistic magnetohydrodynamics I
Karas, Vladimír
2005 - English
The aim of this lecture is to present important basic relations of relativistic magnetohydrodynamics. Cílem této přednášky je podat důležité základní vztahy relativistické magnetohydrodynamiky.
Keywords:
magnetoydrodynamics
Available at various institutes of the ASCR
An introduction to relativistic magnetohydrodynamics I
The aim of this lecture is to present important basic relations of relativistic magnetohydrodynamics.
Cílem této přednášky je podat důležité základní vztahy relativistické magnetohydrodynamiky.
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