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Solar Energetic Particle Spectral Breaks

Mewaldt, R. A. and Cohen, C. M. S. and Mason, G. M. and Labrador, A. W. and Looper, M. L. and Haggerty, D. E. and Maclennan, C. G. and Cummings, A. C. and Desai, M. I. and Leske, R. A. and Li, G. and Mazur, J. E. and Stone, E. C. and Wiedenbeck, M. E. (2005) Solar Energetic Particle Spectral Breaks. In: Physics of Collisionless Shocks. AIP Conference Proceedings. No.781. American Institute of Physics , Melville, NY, pp. 227-232. ISBN 0-7354-0268-X.

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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

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Mewaldt, R. A.0000-0003-2178-9111
Cohen, C. M. S.0000-0002-0978-8127
Mason, G. M.0000-0003-2169-9618
Labrador, A. W.0000-0001-9178-5349
Cummings, A. C.0000-0002-3840-7696
Desai, M. I.0000-0002-7318-6008
Leske, R. A.0000-0002-0156-2414
Li, G.0000-0001-9313-251X
Stone, E. C.0000-0002-2010-5462
Wiedenbeck, M. E.0000-0002-2825-3128
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
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:solar cosmic ray particles, cosmic ray energy spectra, shock waves, acceleration
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2005-03
Series Name:AIP Conference Proceedings
Issue or Number:781
Classification Code:PACS: 96.40.Fg; 96.40.De
Record Number:CaltechAUTHORS:20110825-074422914
Persistent URL:
Official Citation:Solar Energetic Particle Spectral Breaks R. A. Mewaldt, C. M. S. Cohen, G. M. Mason, A. W. Labrador, M. L. Looper, D. E. Haggerty, C. G. Maclennan, A. C. Cummings, M. I. Desai, R. A. Leske, G. Li, J. E. Mazur, E. C. Stone, and M. E. Wiedenbeck, AIP Conf. Proc. 781, 227 (2005), DOI:10.1063/1.2032701
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:25084
Deposited On:25 Aug 2011 15:13
Last Modified:09 Nov 2021 16:29

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