CRRES electric field power spectra and radial diffusion coefficients

D. H. Brautigam, G. P. Ginet, J. M. Albert, J. R. Wygant, D. E. Rowland, A. Ling, J. Bass

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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 Lb 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 DELL is computed from the power spectra. The model average DLL 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.

Original languageEnglish (US)
Article numberA02214
JournalJournal of Geophysical Research: Space Physics
Issue numberA2
StatePublished - Feb 2005


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