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Cerri, S S; Califano, F, E-mail: silvio.cerri@df.unipi.it, E-mail: francesco.califano@unipi.it2017
AbstractAbstract
[en] The understanding of the fundamental properties of turbulence in collisionless plasmas, such as the solar wind, is a frontier problem in plasma physics. In particular, the occurrence of magnetic reconnection in turbulent plasmas and its interplay with a fully-developed turbulent state is still a matter of great debate. Here we investigate the properties of small-scale electromagnetic fluctuations and the role of fast magnetic reconnection in the development of a quasi-steady turbulent state by means of 2D-3V high-resolution Vlasov–Maxwell simulations. At the largest scales turbulence is fed by external random forcing. We show that large-scale turbulent motions establish a spectrum at and, at the same time, feed the formation of current sheets where magnetic reconnection occurs. As a result coherent magnetic structures are generated which, together with the rise of the associated small-scale non-ideal electric field, mediate the transition between the inertial and the subproton-scale spectrum. A mechanism that boosts the magnetic reconnection process is identified, making the generation of coherent structures rapid enough to be competitive with wave mode interactions and leading to the formation of a fully-developed turbulent spectrum across the so-called ion break. (paper)
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Source
Available from http://dx.doi.org/10.1088/1367-2630/aa5c4a; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
Journal
New Journal of Physics; ISSN 1367-2630;
; v. 19(2); [15 p.]

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