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Journal Articles Physical Review Letters Year : 2020

In Situ Observation of Hall Magnetohydrodynamic Cascade in Space Plasma

Riddhi Bandyopadhyay
  • Function : Author
Luca Sorriso-Valvo
  • Function : Author
Alexandros Chasapis
  • Function : Author
Petr Hellinger
  • Function : Author
William H. Matthaeus
  • Function : Author
Andrea Verdini
  • Function : Author
Simone Landi
  • Function : Author
Luca Franci
  • Function : Author
Barbara L. Giles
  • Function : Author
Daniel J. Gershman
  • Function : Author
Thomas E. Moore
  • Function : Author
Craig J. Pollock
  • Function : Author
Christopher T. Russell
  • Function : Author
Robert J. Strangeway
  • Function : Author
Roy B. Torbert
  • Function : Author
James L. Burch
  • Function : Author

Abstract

We present estimates of the turbulent energy-cascade rate derived from a Hall-magnetohydrodynamic (MHD) third-order law. We compute the contribution from the Hall term and the MHD term to the energy flux. Magnetospheric Multiscale (MMS) data accumulated in the magnetosheath and the solar wind are compared with previously established simulation results. Consistent with the simulations, we find that at large (MHD) scales, the MMS observations exhibit a clear inertial range dominated by the MHD flux. In the subion range, the cascade continues at a diminished level via the Hall term, and the change becomes more pronounced as the plasma beta increases. Additionally, the MHD contribution to interscale energy transfer remains important at smaller scales than previously thought. Possible reasons are offered for this unanticipated result.
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Dates and versions

insu-03717010 , version 1 (12-07-2022)

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Riddhi Bandyopadhyay, Luca Sorriso-Valvo, Alexandros Chasapis, Petr Hellinger, William H. Matthaeus, et al.. In Situ Observation of Hall Magnetohydrodynamic Cascade in Space Plasma. Physical Review Letters, 2020, 124, ⟨10.1103/PhysRevLett.124.225101⟩. ⟨insu-03717010⟩
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