Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm24a..03y&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM24A-03
Physics
2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2768 Plasmasphere, 2774 Radiation Belts, 2778 Ring Current
Scientific paper
Coordinated ground-based and satellite observations are of great importance for understanding the electrodynamics of inner-magnetospheric density structures. Examples of these structures are storm enhanced density (SED) and plasmasphere drainage plumes resulting from the erosion of the plasmasphere boundary layer by sub-auroral disturbance electric fields. SED or localized enhancement of TEC results from a poleward redistribution of dusk-sector plasma from the low-latitude region during the early stage of a strong geomagnetic disturbance. While ground-based observations with GPS TEC and ISR combined with low-altitude satellite observations such as DMSP, TOPEX, and JASON see enhanced density structure, IMAGE EUV magnetospheric imagery from space detect this enhanced density as a pronounced bright region in the inner plasmapshere. In this paper, we present coordinated ground-based and satellite observations results showing the role of the plasmasphere and plasmapause in the dynamics of ionospheric density structures. This includes the simultaneous global observations of ground-based GPS TEC and ionospheric TEC observed by the JASON and TOPEX satellites to experimentally determine the percentage contribution of the plasmapshere to the ground- based GPS TEC and thus to the degradation of navigation and communication systems. We find the plasmasphere can contribute significantly to round-based GPS TEC.
Moldwin Mark B.
Yizengaw Endawoke
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