|
Detailed Reference Information |
Shprits, Y.Y., Thorne, R.M., Friedel, R., Reeves, G.D., Fennell, J., Baker, D.N. and Kanekal, S.G. (2006). Outward radial diffusion driven by losses at magnetopause. Journal of Geophysical Research 111: doi: 10.1029/2006JA011657. issn: 0148-0227. |
|
Loss mechanisms responsible for the sudden depletions of the outer electron radiation belt are examined based on observations and radial diffusion modeling, with L*-derived boundary conditions. SAMPEX data for October--December 2003 indicate that depletions often occur when the magnetopause is compressed and geomagnetic activity is high, consistent with outward radial diffusion for L* > 4 driven by loss to the magnetopause. Multichannel Highly Elliptical Orbit (HEO) satellite observations show that depletions at higher L occur at energies as low as a few hundred keV, which excludes the possibility of the electromagnetic ion cyclotron (EMIC) wave-driven pitch angle scattering and loss to the atmosphere at L* > 4. We further examine the viability of the outward radial diffusion loss by comparing CRRES observations with radial diffusion model simulations. Model-data comparison shows that nonadiabatic flux dropouts near geosynchronous orbit can be effectively propagated by the outward radial diffusion to L* = 4 and can account for the main phase depletions of outer radiation belt electron fluxes. |
|
|
|
BACKGROUND DATA FILES |
|
|
Abstract |
|
|
|
|
|
Keywords
Magnetospheric Physics, Radiation belts, Magnetospheric Physics, Energetic particles, precipitating, Magnetospheric Physics, Magnetosphere, inner, Magnetospheric Physics, Energetic particles, trapped, Magnetospheric Physics, Numerical modeling |
|
Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
|
|
|