A New Model of the Galactic Cosmic Ray Radiation Environment at 1 AU based on ACE Measurements

Details A New Model of the Galactic Cosmic Ray Radiation Environment at 1 AU based on ACE Measurements A New Model of the Galactic Cosmic Ray Radiation Environment at 1 AU based on ACE Measurements

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh22a0750d&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH22A-0750

Physics

7514 Energetic Particles (2114), 7536 Solar Activity Cycle (2162)

Scientific paper

The spectra of galactic cosmic ray (GCR) elements from Beryllium to Nickel in the energy range 40 - 500 MeV/nucleon at 1 AU are being continuously measured by instruments on-board the Advanced Composition Explorer (ACE). The collecting power of these instruments allows statistically precise spectra to be calculated every few months for most elements. Measurements of temporal variations in GCR spectra over the solar cycle are important for understanding solar modulation processes, and also for refining models of the near-earth radiation environment used to perform shielding and dose calculations for manned and unmanned space missions. We report on ACE observations of the evolution of GCR element spectra from solar minimum in 1997 through Fall 2001, and we describe a cosmic ray interstellar propagation and solar modulation model that provides an improved fit to the ACE measurements compared to radiation environment models currently in use. We intend to provide online access to this model from the ACE website. This work was supported by NASA contract NAG5-6912.

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