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Updated: Jun 30, 2025

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Turbulence in Magnetic Reconnection Jets from Injection to Sub-Ion Scales.

Louis Richard1, Luca Sorriso-Valvo2, Emiliya Yordanova3

  • 1Swedish Institute of Space Physics, Uppsala 751 21, Sweden and Department of Physics and Astronomy, Space and Plasma Physics, Uppsala University, Uppsala 751 20, Sweden.

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|March 22, 2024
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Turbulence in Earth's magnetotail reconnection jets shows an energy cascade from jet scales to ion scales. This study reveals the largest energy transfer rate observed in space plasmas.

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Area of Science:

  • Space Physics
  • Plasma Physics
  • Astrophysics

Background:

  • Magnetic reconnection is a fundamental process in space plasmas, driving phenomena like auroras and solar flares.
  • Turbulence plays a crucial role in energy dissipation and particle acceleration during magnetic reconnection.

Purpose of the Study:

  • To investigate the characteristics of turbulence within magnetic reconnection jets in Earth's magnetotail.
  • To determine the energy cascade mechanisms and rates in these turbulent jets.
  • To identify the nature of fluctuations at sub-ion scales.

Main Methods:

  • Analysis of in-situ data from the Magnetospheric Multiscale (MMS) spacecraft.
  • Examination of turbulent signatures within reconnection jet structures.
  • Characterization of energy cascade across different scales, from jet scales down to ion scales.

Main Results:

  • Observed signatures of a limited inertial range in numerous reconnection jets.
  • Turbulence develops on timescales of a few ion gyroperiods.
  • An intermittent, multifractal energy cascade occurs from jet scales to ion scales.
  • At sub-ion scales, fluctuations are near-monofractal and identified as kinetic Alfvén waves.
  • The energy transfer rate across the inertial range is approximately 10^8 J kg^-1 s^-1, a record high for space plasmas.

Conclusions:

  • Turbulence in magnetotail reconnection jets exhibits a distinct energy cascade process.
  • Kinetic Alfvén waves dominate at sub-ion scales, indicating specific plasma wave behavior.
  • The exceptionally high energy transfer rate highlights the efficiency of energy dissipation in these events.