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Published August 1, 2005 | Published
Book Section - Chapter Open

Solar Energetic Particle Spectral Breaks


The five large solar particle events during October–November 2003 presented an opportunity to test shock acceleration models with in-situ observations. We use solar particle spectra of H to Fe ions, measured by instruments on ACE, SAMPEX, and GOES-11, to investigate the Q/M-dependence of spectral breaks in the 28 October 2003 event. We find that the break energies scale as (Q/M)^b with b ≈ 1.56 to 1.75, somewhat less than predicted. We also conclude that SEP spectra >100 MeV/nucleon are best fit by a double power-law shape. ©2005 American Institute of Physics

Additional Information

© 2005 American Institute of Physics. Issue Date: 1 August 2005. This work was supported by NASA under grants NNG04GB55G, NNG04088G, and NAG5-12929. We appreciate the availability of GOES-11 data from NOAA's Space Environment Center at http://www.sec.noaa.gov/Data/index.html.

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