搜索结果: 1-15 共查到“天体物理学 the activity”相关记录18条 . 查询时间(0.37 秒)
Ionospheric disturbances generated by different natural processes and by human activity in Earth plasma environment
ionosphere Earth plasma environment
2015/9/14
The magnetosphere-ionosphere-thermosphere subsystem is strongly coupled via the electric field, particle precipitation, heat flows and small scale interaction. Satellites in situ measurements and grou...
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...
High spatial resolution monitoring of the activity of BA supergiant winds
High spatial resolution the activity BA supergiant winds
2011/1/13
There are currently two optical interferometry recombiners that can provide spectral resolutions better than 10000, AMBER/VLTI operating in the H-K bands, and VEGA/CHARA, recently commissioned, opera...
Variation in the frequency separations with activity and impact on stellar parameter determination
Variation frequency separations activity impact
2010/11/15
Frequency separations used to infer global properties of stars through asteroseismology can change depending on the strength and at what epoch of the stellar cycle the p-mode frequencies are measured....
Variable circumstellar activity of V351 Orionis
stars:pre main sequence (stars) circumstellar matter stars:individual
2010/11/16
Context. Emission and absorption line profiles which are formed in the interaction of pre-main sequence (PMS) stars and their circumstellar environment are found to be variable at various timescales.
Long-term chromospheric activity in southern M dwarfs: Gl 229 A and Gl 752 A
stars: activity late-type techniques photometry spectroscopic
2010/11/11
Several late-type stars present activity cycles similar to that of the Sun.However, these cycles have been mostly studied in F to K stars. Due to their small intrinsic brightness, M dwarfs are not usu...
The effect of M dwarf starspot activity on low-mass planet detection thresholds
planetary systems stars activity stars atmospheres stars spots techniques
2010/11/11
In light of the growing interest in searching for low mass, rocky planets, we investigate the
impact of starspots on radial velocity searches for earth-mass planets in orbit about M dwarf
stars. Sin...
Radiative activity of magnetic white dwarf undergoing Lorentz-force-driven torsional vibrations
magnetic white dwarf non-radial pulsations magneto-dipole emission
2010/11/11
We study radiative activity of magnetic white dwarf undergoing torsional vibrations about axis of its own dipole magnetic moment under the action of Lorentz restoring force. It is shown that pulsating...
Intermittent activity of radio sources. Accretion instabilities and jet precession
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/4
We consider the radiation pressure instability operating on short timescales 10^3 - 10^6 years in the accretion disk around a supermassive black hole as the origin of the intermittent activity of radi...
Comparison of AGN and Nuclear Starburst Activity in Seyfert 1 and 2 Galaxies over a Wide Luminosity Range Based on Near-infrared 2-4 micrometer Spectroscopy
Galaxy Astrophysics (astro-ph.GA)
2011/1/4
We present near-infrared K- (1.9-2.5 micrometer) and L- (2.8-4.2 micrometer) band spectroscopy of 22 Seyfert nuclei. We use two methods to investigate the presence of nuclear starbursts.
Dependence of Star Formation Activity On Stellar Mass and Environment From the Redshift One LDSS-3 Emission Line Survey (ROLES)
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2010/12/27
Using the sample from the \it Redshift One LDSS3 Emission line Survey \rm (ROLES), we probe the dependence of star formation rate (SFR) and specific star formation rate (sSFR) as a function of stellar...
Identification of strong photometric activity in the components of LHS 1070
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/27
Activity in low-mass stars is an important ingredient in the evolution of such objects. Fundamental physical properties such as age, rotation, magnetic field are correlated with activity.
A closer view of the radio-FIR correlation: disentangling the contributions of star formation and AGN activity
Galaxy Astrophysics (astro-ph.GA)
2010/12/23
We extend the Unified Radio Catalog, a catalog of sources detected by various (NVSS, FIRST, WENSS, GB6) radio surveys, and SDSS, to IR wavelengths by matching it to the IRAS Point and Faint Source cat...
Effect of Magnetic Activity on Ionospheric Time Delay at Low Latitude
Ionospheric time delay scintillation TEC geomagnetic storm
2010/9/16
The purpose of this work is to investigate the effect of magnetic activity on ionospheric time delay at low latitude Station Bhopal (geom. lat. 23.2◦N, geom. long. 77.6◦E) using dual frequ...
Spectral Classification and Analysis of Nuclear Activity in the UZC-Compact Group Sample
Spectral Classification UZC-Compact Group Sample Nuclear Activity
2009/7/9
Spectral Classification and Analysis of Nuclear Activity in the UZC-Compact Group Sample。