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Termination shock particle spectral features

Cummings, A. C. and Stone, E. C. and McDonald, F. B. and Heikkila, B. C. and Lal, N. and Webber, W. R. (2006) Termination shock particle spectral features. In: Physics of the Inner Heliosheath: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics Conference. AIP Conference Proceedings. No.858. American Institute of Physics , Melville, NY, pp. 86-91. ISBN 978073540355-0.

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Spectral features of energetic H ions accelerated at the termination shock may be evidence of two components. At low energies the energy spectrum is ~E^(–1.55), with break at ~0.4 MeV to E^(–2.2). A second component appears above ~1 MeV with a spectrum of E^(–1.27) with a break at ~3.2 MeV. Even though the intensities upstream are highly variable, the same spectral break energies are observed, suggesting that these are durable features of the source spectrum. The acceleration processes for the two components may differ, with the lower energy component serving as the injection source for diffusive shock acceleration of the higher energy component. Alternatively, the spectral features may result from the energy dependence of the diffusion tensor that affects the threshold for diffusive shock acceleration.

Item Type:Book Section
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Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:©2006 American Institute of Physics. Issue Date: 26 September 2006. The availability of the LECP data2,7 is greatly appreciated. This work was supported by NASA under contract NAS7-03001.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
Subject Keywords:solar wind; shock waves; acceleration; Anomalous cosmic rays; solar wind termination shock; Voyager; shock acceleration
Series Name:AIP Conference Proceedings
Issue or Number:858
Classification Code:PACS: # 96.50.Ek # 96.60.Vg # 96.50.Pw
Record Number:CaltechAUTHORS:20090918-090238147
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Official Citation:Termination shock particle spectral features A. C. Cummings, E. C. Stone, F. B. McDonald, B. C. Heikkila, N. Lal, and W. R. Webber, AIP Conf. Proc. 858, 86 (2006), DOI:10.1063/1.2359310
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15947
Deposited By: George Porter
Deposited On:06 Oct 2009 19:13
Last Modified:08 Nov 2021 23:23

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