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Do Anomalous Cosmic Rays Modify the Termination Shock?

Florinski, V. and Zank, G. P. and Jokipii, J. R. and Stone, E. C. and Cummings, A. C. (2004) Do Anomalous Cosmic Rays Modify the Termination Shock? Astrophysical Journal, 610 (2). pp. 1169-1181. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20140319-135713728

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Abstract

This work extends our previous two-dimensional self-consistent model of the cosmic rays interacting with the solar wind to include anomalous cosmic rays. As before, energetic particles are described kinetically using a Parker equation. The model includes diffusion, convection, and drift effects, as well as shock and compression acceleration and expansion cooling by nonuniform solar wind flow. A new numerical model has been developed featuring an adaptive-mesh refinement algorithm to accommodate small diffusive length scales of low-energy shock-accelerated particles. We show that anomalous cosmic rays have only a minor effect on the termination shock during the time near solar minima. Specifically, cosmic-ray gradients cause the subshock to move away from the Sun by about 1 AU with its compression ratio decreasing by about 5% compared to the reference case without cosmic-ray effects. We also study the effect of solar wind slowdown by charge exchange downstream of the termination shock, producing compressive flow in this region and resulting in additional acceleration of anomalous cosmic rays in the heliosheath. For the first time, spectra calculated with our self-consistent model show a good agreement with the cosmic-ray data from the two Voyager spacecraft, giving more confidence in the model predictions than the previous parametric studies.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/421901 DOIArticle
http://iopscience.iop.org/0004-637X/610/2/1169/PublisherArticle
Additional Information:© 2004 The American Astronomical Society. Received 2004 February 18; accepted 2004 April 14. V. F. and G. P. Z. acknowledge support by NASA grants NAG5-11621 and NAG5-12903. The work of J. R. J. was supported, in part, by NASA grants NAG5-10893 and NAG5-10990 and by the NSF under grant ATM-0330829. The work of E. C. S. and A. C. C. was supported by NASA under contract NAS7-03001.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAG5-11621
NASANAG5-12903
NASANAG5-10893
NASANAG5-10990
NSFATM-0330829
NASANAS7-03001
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2004-04
Record Number:CaltechAUTHORS:20140319-135713728
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140319-135713728
Official Citation:Do Anomalous Cosmic Rays Modify the Termination Shock? V. Florinski et al. 2004 ApJ 610 1169
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44397
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Mar 2014 16:32
Last Modified:23 Mar 2015 21:23

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