HR: 0800h
AN: SA21A-0275    [Abstracts]
TI: Anomalous Nighttime Plasma Structure in the Recovery Phase of a Superstorm
AU: * Mannucci, A J
EM: Tony.Mannucci@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive , Pasadena, CA 91109 United States
AU: Datta-Barua, S
EM: seebany@stanford.edu
AF: Stanford University, Department of Aeronautics and Astronatics, 496 Lomita Mall, Stanford, CA 94305 United States
AU: Walter, T
EM: twalter@stanford.edu
AF: Stanford University, Department of Aeronautics and Astronatics, 496 Lomita Mall, Stanford, CA 94305 United States
AU: Komjathy, A
EM: Attila.Komjathy@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive , Pasadena, CA 91109 United States
AU: Sparks, L
EM: Lawrence.Sparks@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive , Pasadena, CA 91109 United States
AU: Tsurutani, B T
EM: Bruce.Tsurutani@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive , Pasadena, CA 91109 United States
AB: During intense geomagnetic storms, observations of total electron content using orbiting Global Positioning System receivers and spaceborne radar altimeters suggest that large-scale and large-magnitude dayside increases in ionospheric total electron content can occur within a few hours after the onset of solar wind conditions leading to the storm. Particular storms showing this feature are: October 29, 2003, October 30, 2003, and November 7, 2004. Another feature that has emerged in the study of these superstorms is the presence of significant post-dusk localized TEC enhancements over mid-latitudes, during the recovery phase of the storm, that persist until dawn. We will present measurements from ground and space-based GPS receivers that reveal the characteristics of these localized features, where they appear, their persistence and other characteristics. We speculate that these features are difficult to reproduce using existing models of the Earth's ionosphere in the absence of solar radiation to generate plasma. Nevertheless, they may have significant impact on GPS-based navigation systems affected by the ionosphere.
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2441 Ionospheric storms (7949)
SC: SPA-Aeronomy [SA]
MN: Fall Meeting 2005