Abstract
AbstractThe Naval Research Laboratory Sami3 is Also a Model of the Ionosphere (SAMI3) ionosphere/plasmasphere code is used to examine the physics of a long‐lived plasmasphere plume. The May 1994 storm is simulated. Here a plasma density peak was observed in the afternoon sector by multiple spacecraft at geosynchronous orbit on each of 11 continuous days. The storm is modeled by adding a Kp‐driven Volland/Stern‐Maynard/Chen analytic convection potential to the self‐consistent electric potential that is driven by thermosphere winds. Results are compared to measurements of the cold‐ion density from the 1989‐046 spacecraft in geosynchronous orbit. We find that many observed features are reproduced by SAMI3 and that high‐speed, field‐aligned plasma flows from the ionosphere contribute significantly to the plume density.
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