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Whitepaper #092 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: other basic research; space-based missions/projects.
Ulysses observations during its rapid transit over the polar regions of the Sun challenged our understanding of SEP transport in 3 dimensions. This white paper provides the scientific justification for obtaining new measurements out-of-the-ecliptic plane so that we can fully understand particle transport in the inner heliosphere.