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Multi-Spacecraft Measurement Of Turbulence Within A Magnetic Reconnection Jet
Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England..
Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England.;Ecole Polytech, Lab Phys Plasmas, F-91128 Palaiseau, France..
Univ Delaware, Dept Phys & Astron, Bartol Res Inst, Newark, DE 19716 USA..
Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England..
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2015 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 815, no 2, L24Article in journal (Refereed) PublishedText
Abstract [en]

The relationship between magnetic reconnection and plasma turbulence is investigated using multipoint in situ measurements from the Cluster spacecraft within a high-speed reconnection jet in the terrestrial magnetotail. We show explicitly that work done by electromagnetic fields on the particles, J . E, has a non-Gaussian distribution and is concentrated in regions of high electric current density. Hence, magnetic energy is converted to kinetic energy in an intermittent manner. Furthermore, we find that the higher-order statistics of magnetic field fluctuations generated by reconnection are characterized by multifractal scaling on magnetofluid scales and non-Gaussian global scale invariance on kinetic scales. These observations suggest that J . E within the reconnection jet has an analog in fluid-like turbulence theory in that it proceeds via coherent structures generated by an intermittent cascade. This supports the hypothesis that turbulent dissipation is highly nonuniform, and thus these results could have far reaching implications for space and astrophysical plasmas.

Place, publisher, year, edition, pages
2015. Vol. 815, no 2, L24
Keyword [en]
magnetic reconnection, plasmas, turbulence
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:uu:diva-279649DOI: 10.1088/2041-8205/815/2/L24ISI: 000369081700008OAI: oai:DiVA.org:uu-279649DiVA: diva2:909979
Available from: 2016-03-08 Created: 2016-03-02 Last updated: 2016-03-08Bibliographically approved

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Khotyaintsev, Yuri V.
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Swedish Institute of Space Physics, Uppsala Division
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