Solar wind composition measurements by the ULYSSES SWICS experiment during transient solar wind flows

Computer Science

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Magnetohydrodynamic Flow, Mass Spectrometers, Plasma Composition, Solar Wind, Ulysses Mission, Solar Spectrometers, Stellar Mass Ejection, Transient Response

Scientific paper

For the March/April 1991 time period, the alpha/proton abundance ratio, the proton kinetic temperature and speed distributions, and the relative abundance of O(+7) to O(+6) is determined over each 13-minute duty cycle of the Solar Wind Ion Composition Spectrometer (SWICs) experiment on Ulysses. The ratio O(+7)/O(+6) (as a relative measure of ionization temperature) is shown to be useful in identifying possible coronal mass ejection (CME) events. We report measurements of silicon/oxygen abundance ratios and silicon and oxygen charge state distributions in the solar wind during a CME event and compare these compositions to a 'normal' solar wind time period.

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