On the reconstruction of magnetospheric plasma pressure distributions from empirical geomagnetic field models

Details On the reconstruction of magnetospheric plasma pressure distributions from empirical geomagnetic field models On the reconstruction of magnetospheric plasma pressure distributions from empirical geomagnetic field models

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11507211t&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A7, CiteID A07211

Physics

2

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Instruments And Techniques

Scientific paper

Four data-based models of the magnetospheric magnetic field were tested for the degree of their consistency with a static balance between the magnetic and plasma stresses. To that end, best fit distributions of the plasma sheet pressure and its anisotropy were derived in the midnight meridian plane, using two specific forms of the particle distribution function. The tailward limit of the modeling region was placed at R = 20 RE, where the condition of pressure balance with the tail lobe field was used to avoid the multiplicity of solutions of the force balance equation. Best fit solutions were derived by minimizing the rms difference between the magnetic and plasma stress vectors over a set of points within the model plasma sheet at distances 5 ≤ R ≤ 20 RE. The obtained equatorial profiles of P$\perp$ and P$\parallel$ demonstrate a steep decrease of both pressures from the inner to outer boundary and a strong overall increase from quiet to disturbed conditions. The anisotropy ratio β = P$\parallel$/P$\perp$ was found to significantly deviate from unity in the case of TU82 and T87 models, with progressively higher values of β at larger tailward distances. By contrast, more recent T89 and T96 models yielded more realistic results with nearly isotropic pressure in the tail and a moderate pancake-type anisotropy in the inner magnetosphere, consistent with observations.

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