Estimation of the ring current structure through data assimilation of global ENA data into a ring current model

Details Estimation of the ring current structure through data assimilation of global ENA data into a ring current model Estimation of the ring current structure through data assimilation of global ENA data into a ring current model

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43b..05n&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM43B-05

Physics

2730 Magnetosphere: Inner, 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954), 3315 Data Assimilation

Scientific paper

We present a method to estimate distributions of ring current ions and electric potential in the inner magnetosphere by assimilating the series of the ENA data obtained by the HENA imager on board of IMAGE into a kinetic ring current model (CRCM) by Fok et al. (2001). The assimilation is performed by using the partice filter. We assume the magnetospheric electric potential distribution to be unknown, and estimate it in the course of the assimilation process. By determining the electric potential distribution, the ring current ion distribution is also estimated. We assimilated test data generated by a test simulation and confirmed that this method produced reasonable results. Then, we tried to assimilate real data into the model to illustrate that this method provides a valuable way to investigate the global snapshot of the ring current structure and the electric potential. We also discuss about the results of the data assimilation for some magnetic storms.

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