The large-scale plasmaspheric density trough associated with the 24 May 2000 geomagnetic storm: IMAGE EUV observations and global core plasma modeling

Details The large-scale plasmaspheric density trough associated with the 24 May 2000 geomagnetic storm: IMAGE EUV observations and global core plasma modeling The large-scale plasmaspheric density trough associated with the 24 May 2000 geomagnetic storm: IMAGE EUV observations and global core plasma modeling

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm32a24a&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SM32A-24

Physics

2730 Magnetosphere--Inner, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2760 Plasma Convection, 2768 Plasmasphere

Scientific paper

The IMAGE EUV imager observed a plasmaspheric density trough in association with a geomagnetically active period on 24 May 2000. In EUV, this density trough appears as an Archimedes spiral extending from Earth's shadow to approximately 1800 MLT. We present an analysis of this density trough using simulated EUV images. Observational EUV images are subjected to edge analysis to establish the plasmapause L-shell and the location of the density trough in terms of L-shell, MLT extent, and radial width. The plasmaspheric density distribution is modeled using both static and dynamic models for the plasmasphere. The background plasmasphere is then numerically simulated using the 4-parameter plasmaspheric density model contained within the Global Core Plasma Model (GCPM) [Gallagher et al., 2000] and the Dynamic Global Core Plasma Model (DGCPM) [Ober et al., 1997]. Simulated EUV images of the model plasmasphere are produced once an artificial density depletion, matching the observed MLT extent and width, has been removed. Once the azimuthal extent and width of the trough have been simulated, the depth of the artificial density depletion is iteratively adjusted to produce simulated EUV images that approximate observation. The results of this analysis and discussion of possible origins for this density trough will be presented.

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