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Observations of turbulence within reconnection jet in the presence of guide field
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
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2012 (English)In: Geophysical Research Letters, ISSN 0094-8276, Vol. 39, L11104- p.Article in journal (Refereed) Published
Abstract [en]

We present the first comprehensive observations of turbulence properties within high speed reconnection jet in the plasma sheet with moderate guide field. The power spectral density index is about -1.73 in the inertial range, and follows the value of -2.86 in the ion dissipation range. The turbulence is strongly anisotropic in the wave-vector space with the major power having its wave-vector highly oblique to the ambient magnetic field, suggesting that the turbulence is quasi-2D. The measured "dispersion relations" obtained using the k-filtering technique are compared with theory and are found to be consistent with the Alfven-Whistler mode. In addition, both Probability Distribution Functions and flatness results show that the turbulence in the reconnection jet is intermittent (multifractal) at scales less than the proton gyroradius/inertial lengths. The estimated electric field provided by anomalous resistivity caused by turbulence is about 3 mV/m, which is close to the typical reconnection electric field in the magnetotail.

Place, publisher, year, edition, pages
2012. Vol. 39, L11104- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-178655DOI: 10.1029/2012GL052210ISI: 000305145300006OAI: oai:DiVA.org:uu-178655DiVA: diva2:542642
Available from: 2012-08-02 Created: 2012-08-01 Last updated: 2012-08-02Bibliographically approved

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Vaivads, AndrisAndré, MatsFu, Huishan
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Swedish Institute of Space Physics, Uppsala Division
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