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Multi-Spacecraft Measurement Of Turbulence Within A Magnetic Reconnection Jet
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- Osman, K. T. (author)
- Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England.
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- Kiyani, K. H. (author)
- Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England.;Ecole Polytech, Lab Phys Plasmas, F-91128 Palaiseau, France.
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- Matthaeus, W. H. (author)
- Univ Delaware, Dept Phys & Astron, Bartol Res Inst, Newark, DE 19716 USA.
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- 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. (creator_code:org_t)
- 2015
- 2015
- English.
- In: Astrophysical Journal Letters. - 2041-8205 .- 2041-8213. ; 815:2
- Journal article (peer-reviewed)
Abstract
Subject headings
Close
- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Keyword
- magnetic reconnection
- plasmas
- turbulence
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Uppsala University
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