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of 15
pro vyhledávání: '"Jabbari, Sarah"'
Autor:
Jabbari, Sarah
Sunspots and active regions are two of the many manifestations of the solar magnetic field. This field plays an important role in causing phenomena such as coronal mass ejections, flares, and coronal heating. Therefore, it is important to study the o
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-128774
Publikováno v:
Astrophys. J. Lett. 845, L15 (2017)
A turbulent dynamo in spherical geometry with an outer corona is simulated to study the sign of magnetic helicity in the outer parts. In agreement with earlier studies, the sign in the outer corona is found to be opposite to that inside the dynamo. L
Externí odkaz:
http://arxiv.org/abs/1706.09540
Autor:
JABBARI, SARAH
In the last few years, there has been significant progress in the development of a new model for explaining magnetic flux concentrations, by invoking the negative effective magnetic pressure instability (NEMPI) in a highly stratified turbulent plasma
Externí odkaz:
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-103637
Publikováno v:
Mon. Not. Roy. Astron. Soc. 467, 2753-2765 (2017)
Recent direct numerical simulations (DNS) of large-scale turbulent dynamos in strongly stratified layers have resulted in surprisingly sharp bipolar structures at the surface. Here we present new DNS of helically and non-helically forced turbulence w
Externí odkaz:
http://arxiv.org/abs/1607.08897
Publikováno v:
Mon. Not. Roy. Astron. Soc. 459, 4046-4056 (2016)
We consider strongly stratified forced turbulence in a plane-parallel layer with helicity and corresponding large-scale dynamo action in the lower part and non-helical turbulence in the upper. The magnetic field is found to develop strongly concentra
Externí odkaz:
http://arxiv.org/abs/1601.08167
Publikováno v:
ApJ, 805, 166, 2015 June 1
Recent work by Mitra et al. (2014) has shown that in strongly stratified forced two-layer turbulence with helicity and corresponding large-scale dynamo action in the lower layer, a magnetic field occurs in the upper layer in the form of sharply bound
Externí odkaz:
http://arxiv.org/abs/1411.4912
Publikováno v:
Astron. Astrophys. 568, A112 (2014)
The mean-field theory of magnetized stellar convection gives rise to the two possibility of distinct instabilities: the large-scale dynamo instability, operating in the bulk of the convection zone, and a negative effective magnetic pressure instabili
Externí odkaz:
http://arxiv.org/abs/1401.6107
Publikováno v:
Astronomy and Astrophysics 556, A106 (2013)
In the presence of strong density stratification, turbulence can lead to a large-scale instability of a horizontal magnetic field if its strength is in a suitable range (within a few percent of the turbulent equipartition value). This instability is
Externí odkaz:
http://arxiv.org/abs/1302.5841
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