Constraining Ion-Scale Heating and Spectral Energy Transfer in Observations of Plasma Turbulence.,Physical Review Letters

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Constraining Ion-Scale Heating and Spectral Energy Transfer in Observations of Plasma Turbulence.
Physical Review Letters ( IF 8.6 ) Pub Date : 2020-07-06 , DOI: 10.1103/physrevlett.125.025102
Trevor A Bowen ₁ , Alfred Mallet ₁ , Stuart D Bale _{1,

2,

3,

4} , J W Bonnell ₁ , Anthony W Case ₅ , Benjamin D G Chandran _{6,

7} , Alexandros Chasapis ₈ , Christopher H K Chen ₄ , Die Duan _{1,

9} , Thierry Dudok de Wit ₁₀ , Keith Goetz ₁₁ , Jasper S Halekas ₁₂ , Peter R Harvey ₁ , J C Kasper _{5,

13} , Kelly E Korreck ₅ , Davin Larson ₁ , Roberto Livi ₁ , Robert J MacDowall ₁₄ , David M Malaspina _{8,

15} , Michael D McManus _{1,

2} , Marc Pulupa ₁ , Michael Stevens ₅ , Phyllis Whittlesey ₁

Affiliation

Space Sciences Laboratory, University of California, Berkeley, California 94720-7450, USA.
Physics Department, University of California, Berkeley, California 94720-7300, USA.
The Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.
School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, United Kingdom.
Smithsonian Astrophysical Observatory, Cambridge, Massachusetts 02138, USA.
Department of Physics and Astronomy, University of New Hampshire, Durham, New Hampshire 03824, USA.
Space Science Center, University of New Hampshire, Durham, New Hampshire 03824, USA.
Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, Colorado 80303, USA.
School of Earth and Space Sciences, Peking University, Beijing 100871, China.
LPC2E, CNRS and University of Orléans, 3 Avenue de la Recherche Scientifique, 45071 Orléans, France.
School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.
Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA.
Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.
Solar System Exploration Division, NASA/Goddard Space Flight Center, Greenbelt, Maryland 20771, USA.
Astrophysical and Planetary Sciences Department, University of Colorado, Boulder, Colorado, USA.

We perform a statistical study of the turbulent power spectrum at inertial and kinetic scales observed during the first perihelion encounter of the Parker Solar Probe. We find that often there is an extremely steep scaling range of the power spectrum just above the ion-kinetic scales, similar to prior observations at 1 A.U., with a power-law index of around

- 4

. Based on our measurements, we demonstrate that either a significant (

> 50 %

) fraction of the total turbulent energy flux is dissipated in this range of scales, or the characteristic nonlinear interaction time of the turbulence decreases dramatically from the expectation based solely on the dispersive nature of nonlinearly interacting kinetic Alfvén waves.

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