Gershman, Daniel J.Viñas, Adolfo F.Dorelli, John C.Goldstein, MelvynShuster, JasonAvanov, Levon A.Boardsen, ScottStawarz, Julia E.Schwartz, Steven J.Schiff, ConradLavraud, BenoitSaito, YoshifumiPaterson, William R.Giles, Barbara L.Pollock, Craig J.Strangeway, Robert J.Russell, Christopher T.Torbert, Roy B.Moore, Thomas E.Burch, James L.2024-01-182024-01-182018-02-20Daniel J. Gershman, Adolfo F.-Viñas, John C. Dorelli, Melvyn L. Goldstein, Jason Shuster, Levon A. Avanov, Scott A. Boardsen, Julia E. Stawarz, Steven J. Schwartz, Conrad Schiff, Benoit Lavraud, Yoshifumi Saito, William R. Paterson, Barbara L. Giles, Craig J. Pollock, Robert J. Strangeway, Christopher T. Russell, Roy B. Torbert, Thomas E. Moore, James L. Burch; Energy partitioning constraints at kinetic scales in low-β turbulence. Phys. Plasmas 1 February 2018; 25 (2): 022303. https://doi.org/10.1063/1.5009158https://doi.org/10.1063/1.5009158http://hdl.handle.net/11603/31341Turbulence is a fundamental physical process through which energy injected into a system at large scales cascades to smaller scales. In collisionless plasmas, turbulence provides a critical mechanism for dissipating electromagnetic energy. Here, we present observations of plasma fluctuations in low-β turbulence using data from NASA's Magnetospheric Multiscale mission in Earth's magnetosheath. We provide constraints on the partitioning of turbulent energy density in the fluid, ion-kinetic, and electron-kinetic ranges. Magnetic field fluctuations dominated the energy density spectrum throughout the fluid and ion-kinetic ranges, consistent with previous observations of turbulence in similar plasma regimes. However, at scales shorter than the electron inertial length, fluctuation power in electron kinetic energy significantly exceeded that of the magnetic field, resulting in an electron-motion-regulated cascade at small scales. This dominance is highly relevant for the study of turbulence in highly magnetized laboratory and astrophysical plasmas.10 pagesen-USThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.Public Domain Mark 1.0https://creativecommons.org/publicdomain/mark/1.0/Text