Ion-Pressure Equations Derived from Measurements in Space

Details Ion-Pressure Equations Derived from Measurements in Space Ion-Pressure Equations Derived from Measurements in Space

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrvl..95a5004s&link_type=abstract

Physical Review Letters, vol. 95, Issue 1, id. 015004

Astronomy and Astrophysics

Astrophysics

9

Magnetosphere Interactions, Thermodynamics Of Plasmas, Magnetohydrodynamics, Magnetohydrodynamics And Plasmas

Scientific paper

Cluster measurements at the bow shock, the magnetosheath, and the magnetospheric boundary layer are used to derive ion-pressure equations for hot anisotropic plasmas. It is demonstrated that both perpendicular and parallel ion pressures are well approximated by polybaric expressions ∝NγBκ, where N is the plasma density, B is the magnetic field, γ is in the range 0.5 to 2, and κ is between -2 and 0. The parameters derived from observations are distinctively different from those predicted by double-adiabatic theory and are shown to hold for pressure variations over 4 orders of magnitude and for a range of plasma beta (ratio of kinetic/magnetic pressures) between 10-4 and 10. The results are relevant for simulations and theories of astrophysical, solar, interplanetary, and magnetospheric processes based on MHD equations.

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