Harry Arnold

Harry Arnold is a space plasma physics modeler in APL’s Space Exploration Sector. His research focuses on fundamental plasma processes in planetary magnetospheres and the solar wind, with an emphasis on magnetic reconnection, current sheet dynamics, and particle acceleration. He combines kinetic simulations, fluid modeling, and observational data analysis to investigate the multiscale dynamics that drive energy transport in space plasmas.

At APL, Dr. Arnold contributes to projects aimed at advancing our understanding of magnetotail dynamics, thin current sheet evolution, and plasma instabilities. His work supports both mission science and theoretical development, bridging first-principles plasma physics with space environment applications. He has recent experience applying “grey-box” modeling approaches to link large-scale magnetohydrodynamic behavior with kinetic-scale processes, providing new insights into energy conversion in geospace and heliospheric plasmas.

Dr. Arnold’s areas of expertise include magnetospheric physics, kinetic plasma theory, and computational modeling of plasma dynamics. His efforts enhance APL’s capabilities in space environment research and contribute to the Laboratory’s leadership in developing the next generation of heliophysics mission concepts and analysis tools.