Study of alpha component dynamics in the solar wind using the Prognoz satellite

Physics

Scientific paper

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Alpha Particles, Satellite-Borne Instruments, Solar Protons, Solar Wind Velocity, Statistical Analysis, Distribution Functions, Hydrogen Ions, Magnetohydrodynamic Waves, Maxwell-Boltzmann Density Function, Solar Flux, Spectrum Analysis

Scientific paper

The complete results of systematic measurements of the alpha component in the undisturbed solar wind, performed with the aid of the energy-mass analyzer aboard the Prognoz 1 satellite during the period April-September, 1972, are presented. Some of the alpha particle spectra are well described by a Maxwellian distribution, others have thermal tails. The average alpha-proton velocity ratio is 1.03, and approaches 1 if the solar wind flux increases. The average value of the alpha-proton temperature ratio is 3.83. The temperature ratio shows no variation when solar wind flux varies from 0.2 billion to 0.6 billion per sq cm per sec. This suggests that the role of Coulomb collisions between alpha and proton components in the equipartition of thermal energy is not a dominant process.

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