Zobrazeno 1 - 10
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pro vyhledávání: '"Pipin, Valery"'
Solar differential rotation exhibits a prominent feature: its cyclic variations over the solar cycle, referred to as zonal flows or torsional oscillations, are observed throughout the convection zone. Given the challenge of measuring magnetic fields
Externí odkaz:
http://arxiv.org/abs/2402.15647
Publikováno v:
Spa. Sci. Rev. 219, 55 (2023)
Mean-field dynamo theory has important applications in solar physics and galactic magnetism. We discuss some of the many turbulence effects relevant to the generation of large-scale magnetic fields in the solar convection zone. The mean-field descrip
Externí odkaz:
http://arxiv.org/abs/2303.12425
Publikováno v:
ApJ, 911, 90 (2021)
Using a 3D global solver of the linearized Euler equations, we model acoustic oscillations over background velocity flow fields of single-cell meridional circulation with deep and shallow return flows as well as double-cell meridional circulation wit
Externí odkaz:
http://arxiv.org/abs/2101.01220
We propose a novel approach to reconstruct the surface magnetic helicity density on the Sun or sun-like stars. The magnetic vector potential is determined via decomposition of vector magnetic field measurements into toroidal and poloidal components.
Externí odkaz:
http://arxiv.org/abs/1905.00772
Akademický článek
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Torsional oscillations represent bands of fast and slow zonal flows around the Sun, which extend deep into the convection zone and migrate during solar cycles towards the equator following the sunspot butterfly diagram. Analysis of helioseismology da
Externí odkaz:
http://arxiv.org/abs/1809.10776
Autor:
Pipin, Valery, Kosovichev, Alexander
We study turbulent generation of large-scale magnetic fields using nonlinear dynamo models for solar-type stars in the range of rotational periods from 14 to 30 days. Our models take into account non-linear effects of dynamical quenching of magnetic
Externí odkaz:
http://arxiv.org/abs/1602.07815
A new simple dynamo model for stellar activity cycle is proposed. By considering an inhomogeneous mean flow effect on turbulence, it is shown that turbulent cross helicity (velocity--magnetic-field correlation) should enter the expression of turbulen
Externí odkaz:
http://arxiv.org/abs/1601.06348
Akademický článek
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Publikováno v:
Progress in Physics of the Sun and Stars: A New Era in Helio- and Asteroseismology. Edited by H. Shibahashi and A.E. Lynas-Gray. ASP Conf. Proc. Vol. 479. 2013, p.395
Helioseismology provides important constraints for the solar dynamo problem. However, the basic properties and even the depth of the dynamo process, which operates also in other stars, are unknown. Most of the dynamo models suggest that the toroidal
Externí odkaz:
http://arxiv.org/abs/1402.1901