Zobrazeno 1 - 10
of 57
pro vyhledávání: '"WRAY, ALAN A."'
Autor:
Kitiashvili, Irina N., Kosovichev, Alexander G., Wray, Alan A., Sadykov, Viacheslav M., Guerrero, Gustavo
Understanding effects driven by rotation in the solar convection zone is essential for many problems related to solar activity, such as the formation of differential rotation, meridional circulation, and others. We analyze realistic 3D radiative hydr
Externí odkaz:
http://arxiv.org/abs/2203.01484
The detection of Earth-size exoplanets is a technological and data analysis challenge. Future progress in Earth-mass exoplanet detection is expected from the development of extreme precision radial velocity measurements. Increasing radial velocity pr
Externí odkaz:
http://arxiv.org/abs/2202.07087
Autor:
Kitiashvili, Irina N., Wray, Alan A.
Publikováno v:
Proc. of International Astronomical Union, Volume 354, pp. 86-93, 2020 (Eds: by A. Kosovichev, K. Strassmeier and M. Jardine.)
Current state-of-the-art computational modeling makes it possible to build realistic models of stellar convection zones and atmospheres that take into account chemical composition, radiative effects, ionization, and turbulence. The standard 1D mixing
Externí odkaz:
http://arxiv.org/abs/2107.12575
Autor:
Criscuoli, Serena, Kazachenko, Maria, Kitashvili, Irina, Kosovichev, Alexander, Pillet, Valentín Martínez, Nita, Gelu, Sadykov, Viacheslav, Wray, Alan
The next decade will be an exciting period for solar astrophysics, as new ground- and space-based instrumentation will provide unprecedented observations of the solar atmosphere and heliosphere. The synergy between modeling effort and comprehensive a
Externí odkaz:
http://arxiv.org/abs/2101.00011
Publikováno v:
The Astrophysical Journal, 2021, Volume 909, Issue 1, id.35, 14 pp
We analyze the evolution of shock waves in high-resolution 3D radiative MHD simulations of the quiet Sun and their synthetic emission characteristics. The simulations model the dynamics of a 12.8x12.8x15.2 Mm quiet-Sun region (including a 5.2 Mm laye
Externí odkaz:
http://arxiv.org/abs/2008.05995
Autor:
Kitiashvili, Irina N., Kosovichev, Alexander G., Mansour, Nagi N., Wray, Alan A., Sandstrom, Timothy A.
It is generally accepted that solar acoustic (p) modes are excited by near-surface turbulent motions, in particular, by downdrafts and interacting vortices in intergranular lanes. Recent analysis of Solar Dynamics Observatory data by (Zhao et al., 20
Externí odkaz:
http://arxiv.org/abs/1810.06133
Continued progress in observational stellar astrophysics requires a deep understanding of the underlying convection dynamics. We present results of realistic 3D radiative hydrodynamic simulations of the outer layers of a moderate mass star (1.47 Msun
Externí odkaz:
http://arxiv.org/abs/1512.07298
Autor:
Wray, Alan A., Bensassi, Khalil, Kitiashvili, Irina N., Mansour, Nagi N., Kosovichev, Alexander G.
Realistic numerical simulations, i.e., those that make minimal use of ad hoc modeling, are essential for understanding the complex turbulent dynamics of the interiors and atmospheres of the Sun and other stars and the basic mechanisms of their magnet
Externí odkaz:
http://arxiv.org/abs/1507.07999
Publikováno v:
Astrophys.J.700:L178-L181,2009
Discovered in 1909 the Evershed effect represents strong mass outflows in sunspot penumbra, where the magnetic field of sunspots is filamentary and almost horizontal. These flows play important role in sunspots and have been studied in detail using l
Externí odkaz:
http://arxiv.org/abs/0904.3599
We have developed 3D, compressible, non-linear radiative MHD simulations to study the influence of the magnetic field of various strength and geometry on the turbulent convective cells and on the excitation mechanisms of the acoustic oscillations. Th
Externí odkaz:
http://arxiv.org/abs/0901.4369