Long-Term Fluences of Energetic Particles in the Heliosphere

Details Long-Term Fluences of Energetic Particles in the Heliosphere Long-Term Fluences of Energetic Particles in the Heliosphere

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh22a0743m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH22A-0743

Other

2104 Cosmic Rays, 2114 Energetic Particles, Heliospheric (7514), 2118 Energetic Particles, Solar, 2164 Solar Wind Plasma

Scientific paper

We report energy spectra of He, O, and Fe nuclei, extending from ~0.3 keV/nucleon to ~300 MeV/nucleon, integrated over the period from the Fall of 1997 to mid-2000. These fluence measurements were made at 1 AU using data from the SWICS,. ULEIS, SIS, and CRIS instruments on ACE, and include contributions from fast and slow solar wind, coronal mass ejections, pickup ions, impulsive and gradual solar particle events, acceleration in corotating interaction regions and other interplanetary shocks, and anomalous and galactic cosmic rays. Measurements of six additional species are presented in the energy region from ~0.04 to ~100 MeV/nucleon. We discuss the relative contributions of the various particle components, and comment on the shape and time dependence of the measured energy spectra. In the energy range from ~10 keV/nucleon to ~10 MeV/nucleon as many as 100 or more separate particle events somehow combine to produce E-2 power-law spectra that are common to all of the species measured, including 3He. These are the first spectral measurements to extend continuously from solar-wind to cosmic-ray energies. Given the highly variable composition and intensity of the contributing events, the overall similarity of these fluence spectra is surprising.

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