搜索结果: 1-15 共查到“天文学 oscillations”相关记录29条 . 查询时间(0.208 秒)
Isocurvature modes and Baryon Acoustic Oscillations II: gains from combining CMB and Large Scale Structure
Baryon Acoustic Oscillations combining CMB Large Scale Structure
2011/9/29
We consider cosmological parameters estimation in the presence of a non-zero isocurvature contribution in the primordial perturbations. A previous analysis showed that even a tiny amount of isocurvatu...
Oscillations of relativistic axisymmetric tori and implications for modelling kHz-QPOs in neutron-star X-ray binaries
X-rays: binaries – relativity – stars: neutron
2011/10/8
We perform a global linear perturbative analysis, and investigate the oscillation properties of relativistic, non-selfgravitating tori orbiting around neutron stars in the slow rotation limit approxim...
New eigen-mode of spin oscillations in the triplet superfluid condensate in neutron stars
Neutron star Superfl uidity Spin waves
2011/10/14
The eigen mode of spin oscillations with $\omega\simeq \sqrt{58/35}\Delta$ is predicted to exist besides already known spin waves with $\omega \simeq\Delta /\sqrt{5}$ in the triplet superfluid neutron...
Quasi periodic oscillations of solar active regions in connection with their flare activity - NoRH observations
Oscillations, Solar Radio Emission Radio Bursts, Association with Flares
2011/9/29
The sunspot-associated sources at the frequency of 17 GHz give information on plasma parameters in the regions of magnetic field about B=2000 G at the level of the chromosphere-corona transition regio...
Solar-like Oscillations: An Observational Perspective
Solar-like Oscillations Observational Perspective
2011/9/30
Solar-like oscillations are excited stochastically by convection. They occur in stars with an outer convection zone, which includes the Sun and other stars on the lower main sequence, as well as cool ...
Amplitudes of solar-like oscillations: constraints from red giants in open clusters observed by Kepler
Amplitudes solar-like oscillations: constraints clusters observed Kepler
2011/9/27
Scaling relations that link asteroseismic quantities to global stellar properties are important for gaining understanding of the intricate physics that underpins stellar pulsation. The common notion t...
We analyze the recent results of the MiniBooNE short-baseline experiment on antinu_mu -> antinu_e oscillations in a minimal model-independent framework of antineutrino mixing in conjunction with the p...
Trapped, Two-Armed, Nearly Vertical Oscillations in Disks with Toroidal Magnetic Fields
Trapped Two-Armed Nearly Vertical Oscillations
2011/1/13
We have examined trapping of two-armed ($m=2$) nearly vertical oscillations (vertical p-mode) in vertically isothermal ($c_{\rm s}=$ const.) relativistic disks with toroidal magnetic fields. The magne...
Redshift-Space Enhancement of Line-of-Sight Baryon Acoustic Oscillations in the SDSS Main-Galaxy Sample
cosmology large-scale structure of Universe - methods data analysis
2010/11/15
We show that redshift-space distortions of galaxy correlations have a strong e ect on correlation functions with distinct, localized features, like the signature of the Baryon Acoustic Oscillations (B...
Have Baryonic Acoustic Oscillations in the galaxy distribution really been measured?
galaxies: statistics cosmology theory large-scale structure
2010/11/15
Recent publications claim that there is no convincing evidence for measurements of the baryonic acoustic (BAO) feature in galaxy samples using either monopole or radial information. Di erent claims se...
Quasi-biennial oscillations in the solar tachocline caused by magnetic Rossby wave instabilities
Sun oscillations Physical Data and Processes magnetic fields MHD—waves
2010/11/11
Quasi-biennial oscillations (QBO) are frequently observed in the solar activity indices. However, no clear physical mechanism for the observed variations has been suggested so far. Here we study the s...
Damping of longitudinal magneto-acoustic oscillations in slowly varying coronal plasma
magnetohydrodynamics(MHD) - plasmas - Sun corona - waves
2010/11/15
We investigate the propagation of MHD waves in a homogenous, magnetized plasma in a weakly
stratified atmosphere, representing hot coronal loops. In most of earlier studies a time-independent equilib...
Non-axisymmetric oscillations of stratified coronal magnetic loops with elliptical cross-sections
magnetohydrodynamics(MHD) - plasmas - Sun corona - Sun oscillations - waves
2010/11/15
Aims. We study non-axisymmetric oscillations of a straight magnetic tube with an elliptic crosssection and density varying along the tube.
Radial and nonradial oscillations of massive supergiants
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
Stability of radial and nonradial oscillations of massive supergiants is discussed. The kappa-mechanism and strange-mode instability exciteoscillations having various periods in wide ranges of the upp...
Extreme Climate Variations from Milankovitch-like Eccentricity Oscillations in Extrasolar Planetary Systems
Earth and Planetary Astrophysics (astro-ph.EP)
2010/12/28
Although our solar system features predominantly circular orbits, the exoplanets discovered so far indicate that this is the exception rather than the rule.