The Stagger Code for Accurate and Efficient, Radiation-coupled Magnetohydrodynamic Simulations

Autor: Robert F. Stein, Åke Nordlund, Remo Collet, Regner Trampedach

Publikováno v: The Astrophysical Journal, Vol 970, Iss 1, p 24 (2024)

We describe the Stagger code for simulations of magnetohydrodynamic (MHD) systems. This is a modular code with a variety of physics modules that will let the user run simulations of deep stellar atmospheres, sunspot formation, stellar chromospheres a

Externí odkaz: https://doaj.org/article/1ab0dedd271e4bb2bbca5b4f65d3facf

Link between trees of fragmenting granules and deep downflows in MHD simulation

Autor: Z. Frank, Robert F. Stein, J. M. Malherbe, Th. Roudier

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 622, pp.A112. ⟨10.1051/0004-6361/201834283⟩
Astronomy and Astrophysics-A&A, 2019, 622, pp.A112. ⟨10.1051/0004-6361/201834283⟩

Trees of fragmenting granules (TFG) and associated flows are suspected to playa major role in the formation of the network in the quiet Sun. We investigate the counterparts, in terms of dynamics, of surface structures detectable by high resolution ob

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::67ba185e3370c67f107265c549b7024a
https://hal.archives-ouvertes.fr/hal-02178031

Dynamics of Trees of Fragmenting Granules in the Quiet Sun: Hinode/SOT Observations Compared to Numerical Simulation

Autor: Robert F. Stein, Z. Frank, Jean-Marie Malherbe, Th. Roudier

Publikováno v: Solar Physics
Solar Physics, Springer Verlag, 2018, 293 (1), ⟨10.1007/s11207-017-1225-x⟩

We compare horizontal velocities, vertical magnetic fields and evolution of trees of fragmenting granules (TFG, also named families of granules) derived in the quiet Sun at disk center from observations at solar minimum and maximum of the Solar Optic

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fdc113927a0f252b92383e7e593fd60d
https://hal.archives-ouvertes.fr/hal-02178056

The Surface of Stellar Models - Now with more 3D simulations!

Autor: R. Trampedach, Jørgen Christensen-Dalsgaard, Martin Asplund, Åke Nordlund, Robert F. Stein

Publikováno v: EPJ Web of Conferences, Vol 101, p 06064 (2015)

We have constructed a grid of 3D hydrodynamic simulations of deep convective and line-blanketed atmospheres. We have developed a new consistent method for computing and employing T(τ ) relations from these simulations, as surface boundary conditions

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2f86bc20869bd167153e40b7a6645e9a
https://doaj.org/article/f07d22c10859494297feaa509211ad08

Rapid Temporal Variability of Faculae: High‐Resolution Observations and Modeling

Autor: M. van Noort, Åke Nordlund, Mats G. Löfdahl, Göran B. Scharmer, Robert F. Stein, Mats Carlsson, L. Rouppe van der Voort, B. De Pontieu

Publikováno v: The Astrophysical Journal. 646:1405-1420

We present high-resolution G-band observations (obtained with the Swedish 1 m Solar Telescope) of the rapid temporal variability of faculae, which occurs on granular timescales. By combining these observations with magnetoconvection simulations of a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e49e33e9dd3c78f9f81fe121de5f96e6
https://doi.org/10.1086/505074