Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm41b..01s&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM41B-01
Physics
2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions, 2768 Plasmasphere
Scientific paper
The Extreme Ultraviolet Imager (EUV) of the IMAGE Mission records the distribution of He+ in the plasmasphere with a time resolution of 10~minutes and a spatial resolution of 0.1~R E. Each image encompasses all or most of the plasmasphere, to permit study of the structure and dynamics of the plasmasphere in its entirety. The images reveal a host of distinct plasmaspheric features and behaviors. Many of these had already been inferred during the more than three decades of investigations of the plasmasphere using ground-based and in situ techniques, but some of them are new and unexpected. Among the topics studied using this technique are erosion of the plasmasphere during times of increased convection, subsequent refilling, and connections between plasmaspheric and ionospheric structures. EUV images show that the plasmapause rarely conforms to the idealized picture of a smoothly curved boundary. In contrast, the boundary is often highly structured on length scales of 0.3-- 2~R E. We focus on such structures, with particular attention to deep indentations called voids or biteouts. They are of special interest because of their association with continuum kilometric radiation and because of their possible relationship with the density cavities long known from in-situ measurements. In addition to stimulating interest in questions about the mechanisms by which they form and disappear, these features serve as fiducials that show how the cold plasma departs from corotation.
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