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Computational Model of Energetic Particle Fluxes in the Magnetosphere Yu (Evans) Xiang TJHSST Computer Systems Lab 2005-2006 Mentor: Dr. John Guillory, George Mason University Introduction The Earth's magnetosphere is a region of space dominated by Earth's magnetic fields. Motion of energetic charged particles, such as electrons and protons, in this region is affected mainly by these magnetic fields and the induced electric fields. This project seeks to develop a computational model for co-processing energetic particles in the magnetosphere, which will assist in studying the behavior of charged particles and predicting events affected by particle fluxes in this region of space. Figure 1 Earth’s magnetosphere http://liftoff.msfc.nasa.gov/academy/space/Magnetosphere.GIF Problems Description This computational model uses data about the • Gathering data from direct observation of magnetic and electric fields calculated from particle motion in the magnetosphere is very available magnetohydrodynamics (MHD) difficult. code to move a number of charged particles • Electronic equipment, such as on satellites and while neglecting their own fields, energy orbiting telescopes, can be damaged by depositions, and relativistic effects. In regions collisions with energetic particles. where the field conditions satisfy certain constraints, such as the conservation of • Disturbances and particle fluxes in the magnetic moment, only the guiding center’s magnetosphere have direct effects on the movement will be tracked (the north-south ionosphere. bounce, drift due to crossed electric and Solutions this project provides that can be used magnetic fields, and drift due to magnetic to solve these problems field inhomogeneity). In regions where the approximations of the guiding centers’ • Creation of software to assist scientists studying motions break down, the fast gyro motion will energetic particle motion in the magnetosphere. be calculated at the cost of much higher run • Prediction of events involving charged particle time. At each time step, an interpolation fluxes in this region of space. routine will use a matrix of field values calculated from the MHD code to compute the • Testing tool for future models of the magnetic and electric fields. Each particle's magnetosphere. trajectory and energy will be updated and recorded. A simple visualization routine is programmed to provide a qualitative graphical display of the data.