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Friedel, R. H. W., Co-Authors: G. D. Reeves, T. E. Cayton, J. F. Fennell, B. Blake, K. Lorentzen, and S. Kanekal, Title: Unanswered questions regarding outer radiation belt energetic electrons: losses, Reference: EGS-AGU-EGU Joint Assembly, Nice, France, April 6-11, 2003. Reference Type: Invited Talk CEPPAD: true CAMMICE: false RAPID: true Abstract: The dynamics of relativistic electrons in the outer radiation belt have received a lot of recent attention because of their space weather implications and the remaining unanswered questions regarding their transport, acceleration and loss. While most attention has focused on their transport and possible acceleration mechanisms, the loss processes are particularly poorly understood. Dramatic losses occur at the onset of magnetic storms, and enhanced levels of loss are thought to be associated with some wave-particle acceleration processes during storm recovery.

We present here multi-spacecraft data of relativistic electron losses in the outer radiation belt from missions such as LANL GPS and HEO, and compare those to low-altitude measurements of precipitating electrons from missions such as NOAA-POES and SAMPEX, concentrating on the region near L=4, in the heart of the outer zone. Data from GPS indicates that magnetopause shadowing cannot account for the losses seen at L=4, while NOAA-POES data shows little or no enhancement of precipitation for electrons with energies greater than 100 keV, and then mostly at storm onset in MLT sectors from 01 to 14 hours.

We will speculate on some of the possible loss mechanisms that may be operating. Relativistic electron microbursts seen by SAMPEX can be associated with some loss measurements, indicating strong pitch angle scattering into the loss cone, while recent simultaneous measurements from POLAR and CLUSTER may indicate local de-trapping of energetic electrons.

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