Zobrazeno 1 - 10
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pro vyhledávání: '"Toomre, Juri"'
We recently presented the first 3D numerical simulation of the solar interior for which tachocline confinement was achieved by a dynamo-generated magnetic field. In this followup study, we analyze the degree of confinement as the magnetic field stren
Externí odkaz:
http://arxiv.org/abs/2311.10202
Autor:
Matilsky, Loren I., Hindman, Bradley W., Featherstone, Nicholas A., Blume, Catherine C., Toomre, Juri
A major outstanding problem in solar physics is the confinement of the solar tachocline, the thin shear layer that separates nearly solid-body rotation in the radiative interior from strong differential rotation in the convection zone. Here, we prese
Externí odkaz:
http://arxiv.org/abs/2206.12920
Autor:
Bice, Connor P., Toomre, Juri
M-dwarf stars are well known for the intense magnetic activity that many of them exhibit. In cool stars with near-surface convection zones, this magnetic activity is thought to be driven largely by the interplay of convection and the large scale diff
Externí odkaz:
http://arxiv.org/abs/2202.02869
Autor:
Brun, Allan Sacha, Strugarek, Antoine, Noraz, Quentin, Perri, Barbara, Varela, Jacobo, Augsutson, Kyle, Charbonneau, Paul, Toomre, Juri
We use the ASH code to model the convective dynamo of solar-type stars. Based on a series of 15 3-D MHD simulations spanning 4 bins in rotation and mass, we show what mechanisms are at work in these stellar dynamos with and without magnetic cycles an
Externí odkaz:
http://arxiv.org/abs/2201.13218
Autor:
Matilsky, Loren I., Toomre, Juri
For more than thirty years, the dynamical maintenance of the thin solar tachocline has remained one of the central outstanding problems of stellar astrophysics. Three main theories have been developed to explain the tachocline's thinness, but so far
Externí odkaz:
http://arxiv.org/abs/2105.05412
Current state-of-the-art models of the solar convection zone consist of solutions to the Navier-Stokes equations in rotating, 3D spherical shells. Such models are highly sensitive to the choice of boundary conditions. Here, we present two suites of s
Externí odkaz:
http://arxiv.org/abs/2004.00208
Autor:
Bice, Connor P., Toomre, Juri
Publikováno v:
ApJ 893 107 (2020)
In recent years, observers have found that the fraction of M-stars demonstrating significant magnetic activity transitions sharply from roughly $10\%$ for main-sequence stars earlier (more massive) than spectral type M3.5 (0.35 M$_\odot$) to nearly $
Externí odkaz:
http://arxiv.org/abs/2001.05555
Autor:
Matilsky, Loren, Toomre, Juri
The calling card of solar magnetism is the sunspot cycle, during which sunspots regularly reverse their polarity sense every 11 years. However, a number of more complicated time-dependent behaviors have also been identified. In particular, there are
Externí odkaz:
http://arxiv.org/abs/1912.08158
The advent of helioseismology has determined in detail the average rotation rate of the Sun as a function of radius and latitude. These data immediately reveal two striking boundary layers of shear in the solar convection zone (CZ): a tachocline at t
Externí odkaz:
http://arxiv.org/abs/1811.00665
Autor:
Bice, Connor, Toomre, Juri
M-type stars are quickly stepping into the forefront as some of the best candidates in searches for habitable Earth-like exoplanets, and yet many M-dwarfs exhibit extraordinary flaring events which would bombard otherwise habitable planets with ioniz
Externí odkaz:
http://arxiv.org/abs/1809.02238