Conditions for acceleration of energetic ions greater than 30 keV associated with the earth's bow shock

Physics

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Bow Waves, Energetic Particles, Geomagnetism, Interplanetary Space, Ion Accelerators, Shock Wave Interaction, Diffusion Coefficient, Proton Energy, Shock Fronts, Solar Wind, Statistical Analysis

Scientific paper

A statistical analysis of particles (greater than 30 keV/charge) upstream of the earth's bow shock is conducted and shows that the rate of occurrence of upstream particle events is relative to the angle between the magnetic field and the shock normal at the shock intersection point as well as relative to the angle between the magnetic field and the radial direction (i.e., the sun-earth line). In addition, the occurrence rate of upstream particle events relative to the bow shock connection time of a field line convected with the solar wind is presented for a model bow shock. A linear dependence of the diffusion coefficient on energy per charge is apparent with the value of the mean free path of a 30-keV proton found to be about 4 earth radii, and the free escape boundary to be at about 30 earth radii in front of the bow shock.

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