Results 11 to 20 of about 3,903 (221)
Vorticity in the solar photosphere [PDF]
Astronomy & Astrophysics, 2010 Aims. We use magnetic and non-magnetic 3D numerical simulations of solar granulation and G-band radiative diagnostics from the resulting models to analyse the generation of small-scale vortex motions in the solar photosphere. Methods. Radiative MHD simulations of magnetoconvection are used to produce photospheric models.
Shelyag, S. +3 more
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, 2020 Abstract The Sun is a G2V star with an effective temperature of 5780 K. As the nearest star to Earth and the biggest object in the solar system, it serves as a reference for fundamental astronomical parameters such as stellar mass, luminosity, and elemental abundances. It also serves as a plasma physics laboratory.
L P Chitta, H N Smitha, S K Solanki
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Solar photosphere magnetization [PDF]
Astronomy & Astrophysics, 2020 Context.A recent review shows that observations performed with different telescopes, spectral lines, and interpretation methods all agree about a vertical magnetic field gradient in solar active regions on the order of 3 G km−1, when a horizontal magnetic field gradient of only 0.3 G km−1is found.
Véronique Bommier, Bommier, Véronique
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Dynamics of the solar photosphere with IBIS [PDF]
Astronomy & Astrophysics, 2006 Context. We investigate the quiet solar photosphere with the new Interferometric BI-dimensional Spectrometer (IBIS), recently installed at the Dunn Solar Telescope of the National Solar Observatory, Sacramento Peak, NM. Aims. We study the occurrence of reverse granulation in the mid-photosphere, and its properties. Methods.
K. Janssen, G. Cauzzi
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Structure of the solar photosphere studied from the radiation hydrodynamics code ANTARES. [PDF]
Astrophys Space Sci, 2017 The ANTARES radiation hydrodynamics code is capable of simulating the solar granulation in detail unequaled by direct observation. We introduce a state-of-the-art numerical tool to the solar physics community and demonstrate its applicability to model ...
Leitner P +6 more
europepmc +2 more sources
Acoustic wave propagation in the solar sub-photosphere with localised magnetic field concentration: effect of magnetic tension [PDF]
, 2009 Aims: We analyse numerically the propagation and dispersion of acoustic waves in the solar-like sub-photosphere with localised non-uniform magnetic field concentrations, mimicking sunspots with various representative magnetic field configurations ...
Shelyag, S. +14 more
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Simulations of magneto-convection in the solar photosphere [PDF]
, 2004 We have developed a 3D magnetohydrodynamics simulation code for applications in the solar convection zone and photosphere. The code includes a non-local and non-grey radiative transfer module and takes into account the effects of partial ionization.
Shelyag, S. +17 more
core +1 more source
Photospheric high-frequency acoustic power excess in sunspot umbra: signature of magneto-acoustic modes [PDF]
, 2013 We present observational evidence for the presence of MHD (magnetohydrodynamic) waves in the solar photosphere deduced from SOHO/MDI (Solar and Heliospheric Observatory/Michelson Doppler Imager) Dopplergram velocity observations.
Shelyag, S. +14 more
core +1 more source
Stokes diagnostics of simulations of magnetoconvection of mixed-polarity quiet-Sun regions [PDF]
, 2005 Realistic solar magneto-convection simulations including the photospheric layers are used to study the polarization of the Fe I Zeeman-sensitive spectral lines at 6301.5, 6302.5, 15 648 and 15 652 Å.
Shelyag, S. +13 more
core +1 more source
Models of the Solar Photosphere [PDF]
Symposium - International Astronomical Union, 1990 This review summarizes the main properties of the available theoretical models of the solar photosphere and the semiempirical models based primarily on observed spectra in different wavelength regions. LTE and non-LTE semiempirical models are compared with LTE and non-LTE theoretical (radiative equilibrium) models calculated with and without convective
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