Browsing by Author "Huba, J.D."

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    Erosion of the plasmasphere during a storm
    (Wiley, 2017) Krall, J.; Huba, J.D.; Sazykin, S.
    The erosion of the plasmasphere during a storm is analyzed using the Naval Research Laboratory Sami3 is Also a Model of the Ionosphere ionosphere/plasmasphere code, coupled to the Rice Convection Model of the inner magnetosphere and ring current. We reproduce the commonly observed poststorm plasmasphere profile, with strong erosion outside of a sharp, poststorm plasmapause, and weak erosion inside the plasmapause. We find that inclusion of the ring current E field sharpens the poststorm plasmapause. In the case of a weak storm, erosion inside the poststorm plasmapause might not occur. In all cases, plasma flows are dominated by E × B drifts. For strong storms, we find that erosion, both inside and outside of the poststorm plasmapause, is caused by outward E × B drifts.
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    Storm time ionosphere and plasmasphere structuring: SAMI3-RCM simulation of the 31 March 2001 geomagnetic storm
    (American Geophysical Union, 2014) Huba, J.D.; Sazykin, S.
    We present the first self-consistent modeling study of the ionosphere-plasmasphere system response to a geomagnetic storm. We use the coupled SAMI3-Rice Convention Model (RCM) of the global ionosphere and inner magnetosphere, with self-consistent electrodynamics, to simulate the 31 March 2001 magnetic storm. We find that the penetration electric fields associated with the magnetic storm lead to a storm time-enhanced density (SED) in the low- to middle-latitude ionosphere and that the separation in latitude of the Appleton anomaly peaks increases. The SED exhibits magnetic conjugacy, occurring in both the Northern and Southern Hemispheres. Moreover, mapping the boundary of the SED into the equatorial plane coincides with the development of a ﾓplume-likeﾔ structure in the plasmasphere. These preliminary results are consistent with observations.