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Kinetic Theory and Fast Wind Observations of the Electron Strahl

Wilson, Lynn B., III; Horaites, Konstantinos; Viñas, Adolfo F. +2 more

We develop a model for the strahl population in the solar wind - a narrow, low-density and high-energy electron beam centred on the magnetic field direction. Our model is based on the solution of the electron drift-kinetic equation at heliospheric distances where the plasma density, temperature and the magnetic field strength decline as power laws…