Second Annual Report on LWS NASA Grant NAG5-12202 (2003-04)

Mary K. Hudson, PI• The following two slides describe test particle simulations

using MHD fields from the Lyon-Fedder-Mobary global MHD code; explicit results are shown for the Nov 24 2001 CME-storm event which produced a new (> 25 MeV) proton belt at L=2.5 lasting 2 years; spacecraft data showing formation and loss of new belt (during Nov 2003 storm period) follow (Kress et al., GRL, 2004)

• Equatorial plane simulations of plasma sheet electron injection to form electron radiation belt at > 1 MeV inside geosynchronous orbit using MHD fields (Elkington et al, JASTP, 2004) are being compared with 3D model using analytic fields (Dartmouth PhD student Kara Perry)

Test Particle Simulations of Radiation Belts

• 2D: Drift motion of electrons and ions in the equatorial plane is

followed using time-varying fields

from Lyon-Fedder-Mobarry MHD simulation

SEP cutoffs calculated using MHD fields

•3D : Drift and bounce motion followed for

electrons, gyromotion included for ions

LFM-SEP simulations:Effect of solar wind pressure pulse on SEP cutoff surface

modelled using LFM-fields with WIND/ACE input;high density pressure pulse increases SEP exposure

Solar Energetic Proton (SEP) Injection to L=2.5

HEO 1998-068 E>25 MeV Protons WIND Satellite Solar Wind Input Data

Nov 24 2001 CME-Shock

Note CME-Shock Arrival

2 SEP injection events in Nov 01, produced new trapped proton belt at L=2.5

Rapid Changes in Trapped MeV Particle Fluxes

MHD Fields Injection of RadBelt Electrons

Electron simulations by CU/LASP staff scientist and Dartmouth PhD Scot Elkington