Assimilation of Plasma Density Measurements Into the Dynamic Global Core Plasma Model

Details Assimilation of Plasma Density Measurements Into the Dynamic Global Core Plasma Model Assimilation of Plasma Density Measurements Into the Dynamic Global Core Plasma Model

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm52a..04j&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM52A-04

Physics

[1910] Informatics / Data Assimilation, Integration And Fusion, [2712] Magnetospheric Physics / Electric Fields, [2753] Magnetospheric Physics / Numerical Modeling, [2768] Magnetospheric Physics / Plasmasphere

Scientific paper

We will present the results of data assimilation of density measurements into the Dynamic Global Core Plasma Model (DGCPM) using a particle filter approach. Being able to produce accurate maps of plasmaspheric density is important because plasma density gradients are sites of waves which contribute to acceleration or loss of radiation belt particles. The plasmasphere is largely described in terms of plasma flow out of and into the ionosphere, as well as a convection electric field, with the electric field being primarily responsible for the dynamics. The plasmasphere appears to respond in an integral way, meaning that the present drivers for the most part do not manifest themselves in present observations (except of course for a direct measurement of the drivers). Instead, present observations provide constraints to drivers in the past. In this talk we will begin by discussing data assimilation and plasmasphere dynamics. We will then show an example of an assimilation of density measurements from Field Line Resonance, VLF whistler observations, and in-situ observations. We will compare the data assimilation with open-loop plasmasphere runs using existing electric field models and maps, including the output of the AMIE procedure.

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