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Local energy transfer rate and kinetic processes: the fate of turbulent energy in two-dimensional hybrid Vlasov–Maxwell numerical simulations

Part of: Professor Francesco Pegoraro Focus on Space Plasmas

Published online by Cambridge University Press:  15 April 2018

Luca Sorriso-Valvo Open the ORCID record for Luca Sorriso-Valvo [Opens in a new window] ,
Denise Perrone ,
Oreste Pezzi ,
Francesco Valentini ,
Sergio Servidio ,
Ioannis Zouganelis  and
Pierluigi Veltri
Luca Sorriso-Valvo*
Affiliation:
Nanotec/CNR, Sede di Cosenza, Ponte P. Bucci, Cubo 31C, 87036 Rende, Italy
Denise Perrone
Affiliation:
European Space Agency, ESAC, 28692, Madrid, Spain Department of Physics, Imperial College London, London SW7 2AZ, UK
Oreste Pezzi
Affiliation:
Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, Cubo 31C, 87036 Rende, Italy
Francesco Valentini
Affiliation:
Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, Cubo 31C, 87036 Rende, Italy
Sergio Servidio
Affiliation:
Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, Cubo 31C, 87036 Rende, Italy
Ioannis Zouganelis
Affiliation:
European Space Agency, ESAC, 28692, Madrid, Spain
Pierluigi Veltri
Affiliation:
Dipartimento di Fisica, Università della Calabria, Ponte P. Bucci, Cubo 31C, 87036 Rende, Italy
*
†Email address for correspondence: [email protected]
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Abstract

The nature of the cross-scale connections between the inertial-range turbulent energy cascade and the small-scale kinetic processes in collisionless plasmas is explored through the analysis of two-dimensional hybrid Vlasov–Maxwell numerical simulation (HVM), with $\unicode[STIX]{x1D6FC}$ particles, and through a proxy of the turbulent energy transfer rate, namely the local energy transfer (LET) rate. Correlations between pairs of variables, including those related to kinetic processes and to deviation from Maxwellian distributions, are first evidenced. Then, the general properties and the statistical scaling laws of the LET are described, confirming its reliability for the description of the turbulent cascade and revealing its textured topology. Finally, the connection between such proxy and the diagnostic variables is explored using conditional averaging, showing that several quantities are enhanced in the presence of large positive energy flux, and reduced near sites of negative flux. These observations can help in determining which processes are involved in the dissipation of energy at small scales, as for example the ion-cyclotron or mirror instabilities typically associated with perpendicular anisotropy of temperature.

Keywords

plasma nonlinear phenomenaplasma simulationspace plasma physics
Type
Research Article
Information
Journal of Plasma Physics , Volume 84 , Issue 2 , April 2018 , 725840201
Copyright
© Cambridge University Press 2018 

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