Convection Electric Fields and the Diffusion of Trapped Magnetospheric Radiation

Author
Keywords
Abstract
We explore here the possible importance of time-dependent convection electric fields as an agent for diffusing trapped magnetospheric radiation inward toward the earth. By using a formalism (Birmingham, Northrop, and Fälthammar, 1967) based on first principles, and by adopting a simple model for the magnetosphere and its electric field, we succeed in deriving a one-dimensional diffusion equation to describe statistically the loss-free motion of mirroring particles with arbitrary but conserved values of the first two adiabatic invariants M and J. Solution of this equation bears out the fact that reasonable electric field strengths, correlated in time for no longer than the azimuthal drift period of an average particle, move particles toward the earth at a rate at least an order of magnitude faster than electric fields whose source is a fluctuating current on the magnetopause.
Year of Publication
1969
Journal
Journal of Geophysical Research
Volume
74
Number of Pages
2169-2181
Date Published
05/1969
ISSN Number
0148-0227
URL
http://onlinelibrary.wiley.com/doi/10.1029/JA074i009p02169/abstract
DOI
10.1029/JA074i009p02169