Evolution and slow decay of an unusual narrow ring of relativistic electrons near L~3.2 following the September 2012 magnetic storm

摘要: [1] A quantitative analysis is performed on the decay of an unusual ring relativistic electrons between 3 and 3.5 RE, which was observed by Relativistic Electron Proton Telescope instrument Van Allen probes. The formed September 2012 during main phase a magnetic storm due to partial depletion outer radiation belt for L > 3.5, this remnant persisted at energies above 2 MeV, exhibiting only slow decay, until it finally destroyed another 1 October. This long-term stability electron associated with rapid outward migration maintenance plasmapause distances greater than L = 4. thus immune from dynamic process, caused rebuilding L > 4, subject pitch angle scattering plasmaspheric hiss timescales exceeding 10–20 days 3 MeV. At lower energies, much more rapid, consistent absence long-duration below 2 MeV.