HR: 09:00h
AN: SM31A-03 INVITED     [Abstracts]
TI: Relationship Between the Plasmasphere and Relativistic Electron Flux Depletions in Earth's Outer Radiation Belt
AU: * Green, J C
EM: Janet.Green@lasp.colorado.edu
AF: LASP/University of Colorado, Boulder, 1234 Innovation Dr., Boulder, CO 80303 United States
AU: * Green, J C
EM: Janet.Green@lasp.colorado.edu
AF: National Oceanic and Atmospheric Administration, National Geophysical Data Center, 325 Broadway Blvd., Boulder, CO 80305 United States
AU: Onsager, T G
EM: Terry.Onsager@noaa.gov
AF: National Oceanic and Atmospheric Administration Space Environment Center, 325 Broadway Blvd., Boulder, CO 80305 United States
AU: O'Brien, T P
EM: Paul.OBrien@aero.org
AF: Aerospace Corporation, PO Box 92957, Los Angeles, CA 90009-2957 United States
AU: Fraser, B J
EM: brian.fraser@newcastle.edu.au
AF: Newcastle University, University Drive, Callaghan, NSW 2308 Austria
AU: Singer, H J
EM: Howard.Singer@noaa.gov
AF: National Oceanic and Atmospheric Administration Space Environment Center, 325 Broadway Blvd., Boulder, CO 80305 United States
AU: Smith, A J
EM: A.J.Smith@bas.ac.uk
AF: British Antarctic Survey, High Cross, Cambridge, CB3 OET United Kingdom
AU: Baker, D N
EM: Daniel.Baker@lasp.colorado.edu
AF: LASP/University of Colorado, Boulder, 1234 Innovation Dr., Boulder, CO 80303 United States
AU: Kanekal, S G
EM: Shrikanth.Kanekal@noaa.gov
AF: LASP/University of Colorado, Boulder, 1234 Innovation Dr., Boulder, CO 80303 United States
AU: Rigler, E J
EM: Jrigler@colorado.edu
AF: LASP/University of Colorado, Boulder, 1234 Innovation Dr., Boulder, CO 80303 United States
AU: Friedel, R H
EM: friedel@lanl.gov
AF: Los Alamos National Laboratory, ISR-1 MD-D466, Los Alamos, NM 87545-0000 United States
AB: Decades of electron flux measurements from satellites probing Earth's outer Van Allen belt depict a highly variable radiation environment that researchers have been challenged to explain. The erratic flux changes induced by geomagnetic activity suggest that acceleration processes are often countered by profuse loss. Thus, to predict flux variations both processes must be understood. Some acceleration mechanisms have been proposed and tested. However, the conditions and processes that remove electrons from the magnetosphere are still uncertain. Recent work suggests that scattering into the atmosphere may be the dominant process responsible for some flux depletions [Green et al., 2004]. We use a superposed epoch analysis of multi-satellite data to demonstrate how scattering into the atmosphere contributes to flux depletions in the outer radiation belt. We identify waves responsible for scattering the electrons by comparing the local time of precipitating electrons to the local time of observed electromagnetic ion cyclotron (EMIC) and whistler waves. Finally, we examine how changes in the high density plasmasphere enhance or inhibit the growth of these waves and their ability to interact with high energy electrons, thus, indirectly dictating radiation belt electron flux levels.
DE: 2716 Energetic particles, precipitating
DE: 2720 Energetic particles, trapped
DE: 2730 Magnetosphere--inner
DE: 2768 Plasmasphere
SC: SPA-Magnetospheric Physics [SM]
MN: 2005 Joint Assembly