Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Hornig, Gunnar"'
We present a 3D MHD simulation of two merging flux ropes exhibiting self-generated and self-sustaining turbulent reconnection (SGTR) that is fully 3D and fast. The exploration of SGTR is crucial for understanding the relationship between MHD turbulen
Externí odkaz:
http://arxiv.org/abs/2209.04492
The topological underpinning of magnetic fields connected to a planar boundary is naturally described by field line winding. This observation leads to the definition of winding helicity, which is closely related to the more commonly calculated relati
Externí odkaz:
http://arxiv.org/abs/2108.08888
Publikováno v:
Physics of Fluids 33, 056101 (2021)
We study the relaxation of a topologically non-trivial vortex braid with zero net helicity in a barotropic fluid. The aim is to investigate the extent to which the topology of the vorticity field -- characterized by braided vorticity field lines -- d
Externí odkaz:
http://arxiv.org/abs/1907.11071
In this paper we seek to understand the timescale on which the photospheric motions on the Sun braid coronal magnetic field lines. This is a crucial ingredient for determining the viability of the braiding mechanism for explaining the high temperatur
Externí odkaz:
http://arxiv.org/abs/1805.03010
Publikováno v:
Chaos 27, 093102 (2017); doi: http://dx.doi.org/10.1063/1.5000812
We present a simple method to efficiently compute a lower limit of the topological entropy and its spatial distribution for two-dimensional mappings. These mappings could represent either two-dimensional time-periodic fluid flows or three-dimensional
Externí odkaz:
http://arxiv.org/abs/1702.00441
Publikováno v:
(2016) ApJ, 832, 150
We study the effect of photospheric footpoint motions on magnetic field structures containing magnetic nulls. The footpoint motions are prescribed on the photospheric boundary as a velocity field which entangles the magnetic field. We investigate the
Externí odkaz:
http://arxiv.org/abs/1611.03325
Publikováno v:
S. Candelaresi et al (2015) ApJ, 808, 134
We investigate the existence of magnetohydrostatic equilibria for topologically complex magnetic fields. The approach employed is to perform ideal numerical relaxation experiments. We use a newly-developed Lagrangian relaxation scheme that exactly pr
Externí odkaz:
http://arxiv.org/abs/1505.03043
Publikováno v:
Phys. Plasmas 22, 032106 (2015)
We investigate the evolution of field line helicity for magnetic fields that connect two boundaries without null points, with emphasis on localized finite-B magnetic reconnection. Total (relative) magnetic helicity is already recognized as an importa
Externí odkaz:
http://arxiv.org/abs/1501.04856
We present a new code that performs a relaxation of a magnetic field towards a force-free state (Beltrami field) using a Lagrangian numerical scheme. Beltrami fields are of interest for the dynamics of many technical and astrophysical plasmas as they
Externí odkaz:
http://arxiv.org/abs/1405.0942
Autor:
Kleimann, Jens, Hornig, Gunnar
Publikováno v:
Sol. Phys. 200 1/2 (2001) 47-62
Magnetic flux tubes reaching from the solar convective zone into the chromosphere have to pass through the relatively cool, and therefore non-ideal (i.e. resistive) photospheric region enclosed between the highly ideal sub-photospheric and chromosphe
Externí odkaz:
http://arxiv.org/abs/1204.3756