Modeling the effects of radial diffusion and plasmaspheric hiss on outer radiation belt electrons
Article first published online: 27 OCT 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 20, October 2007
How to Cite
2007), Modeling the effects of radial diffusion and plasmaspheric hiss on outer radiation belt electrons, Geophys. Res. Lett., 34, L20112, doi:10.1029/2007GL031598., , , and (
- Issue published online: 27 OCT 2007
- Article first published online: 27 OCT 2007
- Manuscript Accepted: 28 SEP 2007
- Manuscript Revised: 18 SEP 2007
- Manuscript Received: 7 AUG 2007
 We simulate the behaviour of relativistic (976 keV) electrons in the outer radiation belt (3 ≤ L ≤ 7) during the first half of the CRRES mission. We use a 1d radial diffusion model with losses due to pitch-angle scattering by plasmaspheric hiss expressed through the electron lifetime calculated using the PADIE code driven by a global Kp-dependent model of plasmaspheric hiss intensity and fpe/fce. We use a time and energy-dependent outer boundary derived from observations. The model reproduces flux variations to within an order of magnitude for L ≤ 4 suggesting hiss is the dominant cause of electron losses in the plasmasphere near the equator. At L = 5 the model reproduces significant variations but underestimates the size of the variability. We find that during magnetic storms hiss can cause significant losses for L ≤ 6 due to its presence in plumes. Wave acceleration is partially represented by the boundary conditions.