Gyrokinetic Particle Simulation Of Drift Compressional Mode In Magnetic Dipole Geometry

The Pc5 magnetic pulsations dominated by compressional modes have been regularly observed in the Earth's magnetosphere. The objective of this project is to study the linear excitation and nonlinear evolution of these ultra low frequency pulsations, focusing on unstable magnetic trapped particle modes, with kinetic effects due to wave-particle resonance and finite Larmor radius. The method is to develop a three dimensional gyrokinetic particle simulation, with the dipole equilibrium field modelling the Earth's magnetosphere. Results of drift-kinetic simulations will be presented. Currently the code is being benchmarked against analytic results in the gyrokinetic regime.