Open AccessCRRES electric field power spectra and radial diffusion coefficients
Author(s) -
Brautigam D. H.,
Ginet G. P.,
Albert J. M.,
Wygant J. R.,
Rowland D. E.,
Ling A.,
Bass J.
Publication year - 2005
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2004ja010612
Subject(s) - electric field , physics , spectral line , spectral density , diffusion , field (mathematics) , computational physics , range (aeronautics) , atomic physics , quantum mechanics , materials science , mathematics , statistics , pure mathematics , composite material
Combined Release and Radiation Effects Satellite (CRRES) Electric Field Instrument (EFI) data are used to determine the electric field power spectral density as a function of L and Kp over the frequency range 0.2 to 15.9 mHz. The power at each frequency is fit to the function P(L, Kp) = a L b exp(cKp). Assuming a purely electrostatic field and making several other assumptions regarding the azimuthal dependence of the field fluctuations, a Kp‐dependent radial diffusion coefficient D LL E is computed from the power spectra. The model average D LL E for high activity (Kp = 6) are between 1 to 2 orders of magnitude larger than that for low activity (Kp = 1), dependent upon L and first invariant.