Ulysses measurements of the solar cycle variation of ~2-40 MeV/n ions in the inner heliosphere

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Particle Emission, Solar Wind, Composition, Time Series Analysis, Time Variability, Solar Instruments

Scientific paper

We present measurements of energetic (~2 to 40 MeV/n) ion spectra and abundance ratios using the COSPIN/LET instrument flown onboard Ulysses. These measurements span almost a complete solar cycle in time and cover an extensive region of the inner heliosphere (heliocentric distance from 1 to 5 AU and heliographic latitude from the ecliptic to +/-80°). We are able to characterize ions associated with solar energetic particle events and those that belong to the anomalous cosmic ray (ACR) component. Abundance ratios measured in the distinct particle regimes encountered throughout the Ulysses mission are collated and compared to similar measurements made by other spacecraft. We investigate in detail the evolution of the ACR oxygen energy spectrum during solar minimum and relate our observations to models of ACR transport. .

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