HR: 1330h
AN: SM43B-07    [Abstracts]
TI: Specification of >2 MeV Geosynchronous Electrons Based on Solar Wind Measurements
AU: * Burin des Roziers, E
EM: burindes@colorado.edu
AF: Laboratory for Atmospheric and Space Physics / CU-Boulder, 1234 Innovation Dr., Boulder, Co 80303 United States
AU: Li, X
EM: lix@paracel.colorado.edu
AF: Laboratory for Atmospheric and Space Physics / CU-Boulder, 1234 Innovation Dr., Boulder, Co 80303 United States
AB: Relativistic electron flux measurements from geosynchronous satellites show a local-time dependence. This local-time dependence is due to the radial profile of the electron fluxes, the dayside/nightside asymmetry of the Earth's magnetosphere and is also affected by geomagnetic activity, which is in turn affected by the solar wind. Statistical Asynchronous Regression (SAR) was recently used to determine the relationship between electron fluxes measured at different local times, as a function of the Kp index [O'Brien et al. 2001]. In this study, we use measurements directly from the solar wind, instead of the Kp index, as the basis for determining the local-time dependence of geosynchronous energetic electron fluxes. We use solar wind parameters as input in our model to map GOES-10 > 2 MeV electron measurements to other local times and compare with the electron measurements from five LANL geosynchronous satellites, widely spaced in longitude, when they pass through these local times. We explore the effects of solar wind velocity, dynamic pressure, and density on the local-time dependence of geosynchronous electron fluxes. We found that, for the given 3 year data set, only using solar wind velocity gives rise to the best results.
DE: 2700 MAGNETOSPHERIC PHYSICS
DE: 2720 Energetic particles, trapped
DE: 2722 Forecasting
DE: 2730 Magnetosphere--inner
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly