Bow shock associated proton heating in the upstream solar wind

Computer Science

Scientific paper

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Bow Waves, Shock Waves, Solar Protons, Solar Wind, Upstream, Energy Transfer, Heating, Helios 2, Magnetohydrodynamic Waves, Perturbation

Scientific paper

The proton component of the solar wind upstream of the earth's bow shock was investigated. A statistical study of the HEOS 2 satellite data measured from February 1972 to August 1974 was made. Employing T (parallel) B2/n2 as an indicator, the geometry and extent of the upstream proton heating zone and its relation to the bow shock was investigated. The heating process was found to be more effective near the bow shock than further away. When restricting the analysis to data within 10 earth radii from the bow shock an increase of 47% in T (parallel) B2/n2, of 10% in T (parallel), and a decrease of 13% in proton density number for shock perturbed conditions compared to unperturbed conditions were found.

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