Reconnection studies under different types of turbulence driving

2012
journal article
article
62
dc.abstract.enWe study a model of fast magnetic reconnection in the presence of weak turbulence proposed by Lazarian and Vishniac (1999) using three-dimensional direct numerical simulations. The model has been already successfully tested in Kowal et al. (2009) confirming the dependencies of the reconnection speed V_{rec} on the turbulence injection power $P_{inj}$ and the injection scale $l_{inj}$ expressed by a constraint $V_{rec} \sim {P_{inj}}^{1/2}{l_{inj}}^{3/4}$ and no observed dependency on Ohmic resistivity. In Kowal et al. (2009), in order to drive turbulence, we injected velocity fluctuations in Fourier space with frequencies concentrated around $k_{inj} = 1/l_{inj}$, as described in Alvelius (1999). In this paper, we extend our previous studies by comparing fast magnetic reconnection under different mechanisms of turbulence injection by introducing a new way of turbulence driving. The new method injects velocity or magnetic eddies with a specified amplitude and scale in random locations directly in real space. We provide exact relations between the eddy parameters and turbulent power and injection scale. We performed simulations with new forcing in order to study turbulent power and injection scale dependencies. The results show no discrepancy between models with two different methods of turbulence driving exposing the same scalings in both cases. This is in agreement with the Lazarian and Vishniac (1999) predictions. In addition, we performed a series of models with varying viscosity ν. Although Lazarian and Vishniac (1999) do not provide any prediction for this dependence, we report a weak relation between the reconnection speed with viscosity, $V_{rec} \sim v^{-1/4}$.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorKowal, Grzegorz - 160119 pl
dc.contributor.authorLazarian, A.pl
dc.contributor.authorVishniac, E. T.pl
dc.contributor.authorOtmianowska-Mazur, Katarzyna - 131220 pl
dc.date.accessioned2016-05-20T10:31:02Z
dc.date.available2016-05-20T10:31:02Z
dc.date.issued2012pl
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.number2pl
dc.description.physical297-314pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume19pl
dc.identifier.doi10.5194/npg-19-297-2012pl
dc.identifier.eissn1607-7946pl
dc.identifier.issn1023-5809pl
dc.identifier.urihttp://ruj.uj.edu.pl/xmlui/handle/item/26603
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licenceCC-BY
dc.rights.uri*
dc.share.typeinne
dc.subtypeArticlepl
dc.titleReconnection studies under different types of turbulence drivingpl
dc.title.journalNonlinear Processes in Geophysicspl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
We study a model of fast magnetic reconnection in the presence of weak turbulence proposed by Lazarian and Vishniac (1999) using three-dimensional direct numerical simulations. The model has been already successfully tested in Kowal et al. (2009) confirming the dependencies of the reconnection speed V_{rec} on the turbulence injection power $P_{inj}$ and the injection scale $l_{inj}$ expressed by a constraint $V_{rec} \sim {P_{inj}}^{1/2}{l_{inj}}^{3/4}$ and no observed dependency on Ohmic resistivity. In Kowal et al. (2009), in order to drive turbulence, we injected velocity fluctuations in Fourier space with frequencies concentrated around $k_{inj} = 1/l_{inj}$, as described in Alvelius (1999). In this paper, we extend our previous studies by comparing fast magnetic reconnection under different mechanisms of turbulence injection by introducing a new way of turbulence driving. The new method injects velocity or magnetic eddies with a specified amplitude and scale in random locations directly in real space. We provide exact relations between the eddy parameters and turbulent power and injection scale. We performed simulations with new forcing in order to study turbulent power and injection scale dependencies. The results show no discrepancy between models with two different methods of turbulence driving exposing the same scalings in both cases. This is in agreement with the Lazarian and Vishniac (1999) predictions. In addition, we performed a series of models with varying viscosity ν. Although Lazarian and Vishniac (1999) do not provide any prediction for this dependence, we report a weak relation between the reconnection speed with viscosity, $V_{rec} \sim v^{-1/4}$.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Kowal, Grzegorz - 160119
dc.contributor.authorpl
Lazarian, A.
dc.contributor.authorpl
Vishniac, E. T.
dc.contributor.authorpl
Otmianowska-Mazur, Katarzyna - 131220
dc.date.accessioned
2016-05-20T10:31:02Z
dc.date.available
2016-05-20T10:31:02Z
dc.date.issuedpl
2012
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.numberpl
2
dc.description.physicalpl
297-314
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
19
dc.identifier.doipl
10.5194/npg-19-297-2012
dc.identifier.eissnpl
1607-7946
dc.identifier.issnpl
1023-5809
dc.identifier.uri
http://ruj.uj.edu.pl/xmlui/handle/item/26603
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
CC-BY
dc.rights.uri*
dc.share.type
inne
dc.subtypepl
Article
dc.titlepl
Reconnection studies under different types of turbulence driving
dc.title.journalpl
Nonlinear Processes in Geophysics
dc.typepl
JournalArticle
dspace.entity.type
Publication
Affiliations

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