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Compressible Magnetohydrodynamic Turbulence in the Earth's Magnetosheath: Estimation of the Energy Cascade Rate Using in situ Spacecraft Data
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Univ Paris Saclay, Univ Paris Sud, PSL Res Univ, LPP,CNRS,Ecole Polytech,Observ Paris,Sorbonne Uni, F-91128 Palaiseau, France..
Univ Paris Saclay, Univ Paris Sud, PSL Res Univ, LPP,CNRS,Ecole Polytech,Observ Paris,Sorbonne Uni, F-91128 Palaiseau, France..
Univ Paris Saclay, Univ Paris Sud, PSL Res Univ, LPP,CNRS,Ecole Polytech,Observ Paris,Sorbonne Uni, F-91128 Palaiseau, France..
Wuhan Univ, Sch Elect Informat, Wuhan 430072, Hubei, Peoples R China..
2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, no 5, article id 055102Article in journal (Refereed) Published
Abstract [en]

The first estimation of the energy cascade rate vertical bar epsilon(C)vertical bar of magnetosheath turbulence is obtained using the Cluster and THEMIS spacecraft data and an exact law of compressible isothermal magnetohydrodynamics turbulence. The mean value of vertical bar epsilon(C)vertical bar is found to be close to 10(-13) Jm(-3) s(-1), at least 2 orders of magnitude larger than its value in the solar wind (similar to 10(-16) Jm(-3) s(-)1 in the fast wind). Two types of turbulence are evidenced and shown to be dominated either by incompressible Alfvenic or compressible magnetosoniclike fluctuations. Density fluctuations are shown to amplify the cascade rate and its spatial anisotropy in comparison with incompressible Alfvenic turbulence. Furthermore, for compressible magnetosonic fluctuations, large cascade rates are found to lie mostly near the linear kinetic instability of the mirror mode. New empirical power-laws relating vertical bar epsilon(C)vertical bar to the turbulent Mach number and to the internal energy are evidenced. These new findings have potential applications in distant astrophysical plasmas that are not accessible to in situ measurements.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 120, no 5, article id 055102
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-346223DOI: 10.1103/PhysRevLett.120.055102ISI: 000423435400007PubMedID: 29481187OAI: oai:DiVA.org:uu-346223DiVA, id: diva2:1191363
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-03-19Bibliographically approved

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Hadid, Lina Z

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