AS414RadBelt

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Published on November 5, 2007

Author: Clarice

Source: authorstream.com

Slide1:  (after Thorne) Radiation Belts (Van Allen Belts) in the Magnetosphere :  Radiation Belts (Van Allen Belts) in the Magnetosphere Ring current Slide3:  Van Allen Radiation Belts inner belt outer belt Slot region Basic Definition: Radiation Belts:  Basic Definition: Radiation Belts Energetic: 400 keV – 10 MeV. Tenuous: <<1 cm-3 Source: The plasma sheet in the near-Earth magnetotail. Acceleration mechanisms still debated. Mostly Protons & Electrons: some He++, traces of heavier ions. Drift dominated by magnetic field: Trapped orbits plus diffusion Important: Total energy small, energy per particle very significant. Slide5:  Van Allen Radiation Belts: Variability inner belt outer belt Slot region SAMPEX electrons: 2 - 6 MeV slot region L = 2 - 3 Outer belt inner belt The effect of the Halloween Storm on the Radiation Belts:  The effect of the Halloween Storm on the Radiation Belts Baker et al., 2004, Nature Plasmasphere images Storms have an unpredictable effect on the radiation belts, they can cause an enhancement or a loss. slot region new belt March 91 Shock Acceleration:  March 91 Shock Acceleration 3.5 MeV at L=6.6, t=0 (M =11,150 MeV/G) Elkington et al., JASTP, 02; 04 MHD Fields Injection of RadBelt Electrons:  MHD Fields Injection of RadBelt Electrons Elkington et al., JASTP, 2004 E_phi (left) and Solar Energetic Electron Trajectory (right):  E_phi (left) and Solar Energetic Electron Trajectory (right) Halloween ‘03 solar energetic electron injection event Kress et al., 2006

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