Zobrazeno 1 - 10
of 60
pro vyhledávání: '"Ziegler, Udo"'
Autor:
Gressel, Oliver, Ziegler, Udo
Astrophysical accretion discs that carry a significant mass compared with their central object are subject to the effect of self-gravity. In the context of circumstellar discs, this can, for instance, cause fragmentation of the disc gas, and -- under
Externí odkaz:
http://arxiv.org/abs/2407.11648
We numerically studied magnetic reconnection in a high $\beta$ hydrogen-helium plasma at different altitudes from the photosphere to the upper chromosphere. The time dependent ionization degrees were included to get more realistic diffusivities and v
Externí odkaz:
http://arxiv.org/abs/2306.08235
Publikováno v:
A&A 672, A64 (2023)
We generate a model description of the solar wind based on an explicit wave-turbulence-driven heating mechanism, and constrain our model with observational data. We included an explicit coronal heating source term in the general 3D magnetohydrodynami
Externí odkaz:
http://arxiv.org/abs/2302.06493
Ellerman bombs (EBs) and Ultraviolet (UV) bursts are common brightening phenomena which are usually generated in the low solar atmosphere of emerging flux regions. In this paper, we have investigated the emergence of an initial un-twisted magnetic fl
Externí odkaz:
http://arxiv.org/abs/2105.08995
The Kelvin-Hemholtz (K-H) instability in the corona EUV jet is studied via 2.5 MHD numerical simulations. The jet results from magnetic reconnection due to the interation of the new emerging magnetic field and the pre-existing magnetic field in the c
Externí odkaz:
http://arxiv.org/abs/1801.09511
Publikováno v:
A&A 607, A1 (2017)
Context: Long-term variability in solar cycles represents a challenging constraint for theoretical models. Mean-field Babcock-Leighton dynamos that consider non-instantaneous rising flux tubes have been shown to exhibit long-term variability in their
Externí odkaz:
http://arxiv.org/abs/1707.06781
(Abridged) Based on the rapidly increasing all-sky data of Faraday rotation measures and polarised synchrotron radiation, the Milky Way's magnetic field is now modelled with an unprecedented level of detail and complexity. We aim to complement this h
Externí odkaz:
http://arxiv.org/abs/1310.6209
We present global hydrodynamic and magnetohydrodynamic (MHD) simulations with mesh refinement of accreting planets embedded in protoplanetary disks (PPDs). The magnetized disk includes Ohmic resistivity that depends on the overlying mass column, lead
Externí odkaz:
http://arxiv.org/abs/1309.2871
In this paper we investigate, by means of two-dimensional magnetohydrodynamic simulations, the impact of temperature-dependent resistivity and thermal conduction on the development of plasmoid instabilities in reconnecting current sheets in the solar
Externí odkaz:
http://arxiv.org/abs/1308.2476
Autor:
Krause, Martin, Fierlinger, Katharina, Diehl, Roland, Burkert, Andreas, Voss, Rasmus, Ziegler, Udo
We study the evolution of isolated and merging interstellar bubbles of three stars (25, 32 and 60 M\odot) in a homogeneous background medium with a density of 10 mp /ccm via 3D-hydrodynamic simulations with standard ISM thermodynamics (optically thin
Externí odkaz:
http://arxiv.org/abs/1207.7231