Bidirectional Energy Cascades and the Origin of Kinetic Alfvénic and Whistler Turbulence in the Solar Wind

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PhysRevLett.112.061101.pdf (1.18 MB)

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https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.061101

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https://doi.org/10.1103/PhysRevLett.112.061101
 http://hdl.handle.net/11603/31300

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UMBC Goddard Planetary Heliophysics Institute (GPHI)

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https://orcid.org/0000-0002-5317-988X

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2014-02-11

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journal articles
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Che, H., M. L. Goldstein, and A. F. Viñas. “Bidirectional Energy Cascades and the Origin of Kinetic Alfv\’enic and Whistler Turbulence in the Solar Wind.” Physical Review Letters 112, no. 6 (February 11, 2014): 061101. https://doi.org/10.1103/PhysRevLett.112.061101.

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Abstract

The observed steep kinetic scale turbulence spectrum in the solar wind raises the question of how that turbulence originates. Observations of keV energetic electrons during solar quiet time suggest them as a possible source of free energy to drive kinetic turbulence. Using particle-in-cell simulations, we explore how the free energy released by an electron two-stream instability drives Weibel-like electromagnetic waves that excite wave-wave interactions. Consequently, both kinetic Alfvénic and whistler turbulence are excited that evolve through inverse and forward magnetic energy cascades.