Results 11 to 20 of about 1,966 (233)
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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The Astrophysical Journal, 2023 Observations show that there are twisted magnetic flux tubes and plasma flow throughout the solar atmosphere. The main purpose of this work is to obtain the damping rate of sausage modes in the presence of magnetic twist and plasma flow.
Mohammad Sadeghi +2 more
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Waves in the solar photosphere [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 The solar photosphere is a partially ionized medium with collisions between electrons, various metallic ions and neutral hydrogen playing an important role in the momentum and energy transport in the medium. Furthermore, the number of neutral hydrogen atom could be as large as $10^{4}$ times the number of plasma particles in the lower photosphere.
Pandey, Birendra B.P. +2 more
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Center–Limb Variation of Solar Photospheric Microturbulence [PDF]
Solar Physics, 2022 22 pages, 7 figures, 4 tables; accepted for publication in Solar ...
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The Astrophysical Journal, 2023 We study the extent to which Milne–Eddington inversions are able to retrieve and characterize the magnetic landscape of the solar poles from observations by the spectropolarimeter on board Hinode.
Rebecca Centeno +4 more
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Inferring depth-dependent plasma motions from surface observations using the DeepVel neural network
Journal of Space Weather and Space Climate, 2021 Coverage of plasma motions is limited to the line-of-sight component at the Sun’s surface. Multiple tracking and inversion methods were developed to infer the transverse motions from observational data.
Tremblay Benoit +4 more
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Proper Orthogonal Decomposition of Solar Photospheric Motions
Physical Review Letters, 2005 The spatio-temporal dynamics of the solar photosphere is studied by performing a Proper Orthogonal Decomposition (POD) of line of sight velocity fields computed from high resolution data coming from the MDI/SOHO instrument. Using this technique, we are able to identify and characterize the different dynamical regimes acting in the system. Low frequency
VECCHIO A. +7 more
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MAGNETOHYDRODYNAMICS OF THE WEAKLY IONIZED SOLAR PHOTOSPHERE [PDF]
The Astrophysical Journal, 2012 We investigate the importance of ambipolar diffusion and Hall currents for high-resolution comprehensive ('realistic') photospheric simulations. To do so we extended the radiative magnetohydrodynamics code \emph{MURaM} to use the generalized Ohm's law under the assumption of local thermodynamic equilibrium.
Cheung, M., Cameron, R.
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The Astrophysical JournalWe report and discuss the phase shift and phase travel time of low-frequency ( ν < 5.0 mHz) acoustic waves estimated within the photosphere and photosphere–chromosphere interface regions, utilizing multiheight velocities in the quiet Sun.
Hirdesh Kumar +4 more
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Simulated magnetic flows in the solar photosphere [PDF]
Astronomy & Astrophysics, 2015 Recent Sunrise/IMaX observations have revealed the existence of supersonic magnetic flows. Our aim is to determine the origin of such flows by using realistic MHD simulations. We simulate cancellation and emergence of magnetic flux through the solar photosphere. Our first numerical experiment starts with magnetic field of both polarities.
Danilovic, S., Cameron, R., Solanki, S.
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