Physics
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jgra..11402203s&link_type=abstract
Journal of Geophysical Research, Volume 114, Issue A2, CiteID A02203
Physics
4
Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Energetic Particles: Trapped, Space Weather: Space Radiation Environment, Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Magnetic Storms And Substorms (7954)
Scientific paper
To quantify radiation belt variability, while de-emphasizing internal transport, the total number of electrons in the outer belt has been computed from data taken on the Polar satellite as a function of time throughout 1998 and of kinetic energy in the range 0.8 to 6.4 MeV. Changes in this electron content are resolved on timescales from ~1 day to several months. The variability is greatest at the higher energies, with several distinct (factor $\lesssim$103) injections followed by extended ($\lesssim$100 day) periods of decay. Time-dependent magnetic field models are unable to accurately remove changes caused by adiabatic variations, but calculations based on a modified dipole field show that this can be achieved. Corrections are also made for radial transport conserving an adiabatic invariant. They show that seemingly small injections at high L may really be of comparable magnitude to large injections at low L.
Kanekal Shrikanth G.
Selesnick Richard S.
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