Preferential Perpendicular Heating of Coronal Hole Heavy Ions by the Fermi Mechanism

Statistics – Computation

Scientific paper

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7511 Coronal Holes, 7827 Kinetic And Mhd Theory, 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7846 Plasma Energization, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

One of the most peculiar features of the fast solar wind is the preferential energization of heavy ions (those more massive than protons). Observations by UVCS/SOHO have shown that much of this preferential heating takes place within 4 solar radii in coronal holes. The observed preferential acceleration naturally follows from the perpendicular heating in a radially decreasing magnetic field. We demonstrate that this perpendicular heating can result from the cyclotron resonant interaction with both inward and outward propagating ion cyclotron waves, yielding a low-energy form of Fermi acceleration. This process is not available to protons, so a preferential heating results. We will present the equations describing this process and discuss results from a computational model.

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