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Hourly averaged particle flux data from the Helios 2 spacecraft's E6 experiment, measuring protons, electrons, and alpha particles in interplanetary space. The dataset covers the energy range from 0.3 MeV to 51 MeV and was collected by a particle telescope developed by Germany in cooperation with NASA. Data spans the mission's operational range from 0.3 to 1.0 Astronomical Units (AU).
License is listed as 'other-license-specified'; specific terms must be checked. Negative values (-0.99999E+04) indicate missing or invalid data.