资源环境科技发展态势分析平台

Magnetosonic waves have been demonstrated as effective for bounce resonant scattering. Electron scattering rates due to bounce resonance interaction with magnetosonic waves are derived in a general form, where the effects of the finite Larmor radius, of violation in the first adiabatic invariant, and of latitudinal wave power distribution are considered. Such bounce resonance diffusion coefficients are important, but missing, from radiation belt modeling. Additionally, we provide a parametric study on the electron energy and equatorial pitch angle, magnetosonic wave, and background parameters to identify the factors that determine effective bounce resonant scattering.

Plain Language Summary Energetic particles, like electrons, emitted from the Sun become trapped in the Earth's magnetic field and form a complicated system of plasma currents known as the magnetosphere. Electrons in the magnetosphere move in ways that are difficult to model. Understanding the behavior of energetic particles in the plasma of the magnetosphere is important for planning both manned, and unmanned, space missions. Typically, there are many waves and particles in the magnetosphere, so identifying and studying each interaction makes modeling a complete magnetosphere possible. Magnetosonic waves are plasma waves that disturb electrons in ways that previous theories could not predict, but data have always shown. In this study, we use our own model to look at the spread of many electrons, bouncing along the magnetic field lines, after encountering multiple magnetosonic waves. It was found that considering the radius of the gyration of the particle and a realistic geometry of the wave are important to the outcome of the interaction. The spread of the particles is called diffusion and can be used in larger-scale models to better predict the dynamics of the magnetosphere as a tool to help plan future space missions.