Energetic Particle Fluences from Solar Wind to Cosmic Ray Energies

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Presentation transcript:

Energetic Particle Fluences from Solar Wind to Cosmic Ray Energies Time-integrated intensities (fluences) of He, O, and Fe have been obtained that extend from solar wind to cosmic ray energies (from ~300 eV/nuc to ~300 MeV/nuc). The data were obtained by the SWICS, ULEIS, SIS and CRIS instruments on ACE from 9/1997 to 6/2000, a period that included both solar minimum and solar maximum conditions. The peak at ~800 eV/nuc is due to ~400 km/s solar wind. Occasional high-speed streams produce a “shoulder” on the solar wind distribution. The origin of the suprathermal tails is presently being debated. From ~10 keV/nuc to ~10 MeV/nuc as many as 100 or more solar and interplanetary events combine to give a power-law spectrum with -2 slope. Galactic cosmic rays dominate at energies >100 MeV/nuc. These are the first spectra to extend continuously from solar wind to cosmic ray energies. Given the varied composition of the contributing events, the overall similarity of these spectra is surprising. Contributed by R. Mewaldt, G. Gloeckler, and G. Mason