Critical Issues in Space Physics

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Wave-particle interactions are vitally important in, and fundamental to plasma physics, with widespread applications to space and astrophysical phenomena. They link the generation and properties of waves and radiation with the heating, acceleration, and transport of plasma particles. The research program aims to develop theories tested with observational data that resolve four critical issues in space physics: (1) whether linear mode conversion is important, (2) why waves and radiation are typically bursty, (3) how heating and particle acceleration occur in magnetic reconnection regions such as the solar atmosphere, and (4) how to explain important solar, interplanetary, and magnetospheric radio phenomena that depend on both microscopic wave-particle physics and largescale source structure.