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1973 
Measurements at conjugate points on the ground near L = 4 of the power spectra of magneticfield fluctuations in the frequency range 0.5 to 20 mHz are used as a means of estimating daily values for the relativisticelectron radialdiffusion coefficient DLL for two periods in December 1971 and January 1972. The values deduced for L10 DLL show a strong variation with magnetic activity, as measured by the Fredricksburg magnetic index KFR. The radialdiffusion coefficient typically increases by a factor of \~10 for a unit increase in KFR. When KFR ≲ 2, it is generally found that DLL ≲ 2 \texttimes 109 L10 day1 for equatorially mirroring electrons having a first invariant M = 750 Mev/gauss; a value of DLL \~4 \texttimes 107 L10 day1 is deduced for one day on which the mean KFR was 4.5. The quantity L10 DLL theoretically depends on energy and L as (L/M)(s2)/2 for relativistic particles, where s is the logarithmic slope of the powerlaw spectrum of magnetic fluctuations observed on the ground. For the time period analyzed, s typically had values between 1 and 3. Lanzerotti, L.; Morgan, Caroline; Published by: Journal of Geophysical Research Published on: 08/1973 YEAR: 1973 DOI: 10.1029/JA078i022p04600 
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