Updating Empirical Models of Magnetospheric Plasma: Comparing the Polar Results With a Decade of SCATHA Data

Details Updating Empirical Models of Magnetospheric Plasma: Comparing the Polar Results With a Decade of SCATHA Data Updating Empirical Models of Magnetospheric Plasma: Comparing the Polar Results With a Decade of SCATHA Data

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm12a..04r&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM12A-04

Physics

[2764] Magnetospheric Physics / Plasma Sheet, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

Ten years of data from the SCATHA spacecraft are used to construct an 3-d empirical model of the plasma in the inner magnetosphere at L~4.5-8. The instrument measures electrons at energies of 0.087-19.4 keV and protons at 0.074-15.6 keV. The model includes the mean and variance of the equatorial pitch angle distributions of the electrons and protons as a function of magnetic local time and L. Over two years of data from the CAMMICE/MICS ion composition instrument on the NASA Polar spacecraft were previously used to construct a similar model at L~2-10 [1]. The high-inclination orbit of Polar left large gaps in the spatial coverage of the model, particularly at high L for perpendicular fluxes. The low-inclination SCATHA orbit fills in those gaps, making the combined model more robust. The large size of the SCATHA data set enables a better description of the plasma distributions as a function of geomagnetic activity, in contrast to the CAMMICE model, which is heavily weighted toward quiet intervals. The long SCATHA mission also offers the promise of detection of a possible solar cycle variation in the plasma distributions. Reference: [1] Roeder, J. L.,M.W. Chen, J. F. Fennell, and R. Friedel (2005), Empirical models of the low-energy plasma in the inner magnetosphere, Space Weather, 3, S12B06, doi:10.1029/2005SW000161.

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