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A Tilt Model for Anomalous Cosmic Rays and the Location of the Solar Wind Termination Shock

Stone, E. C. and Cummings, A. C. (1999) A Tilt Model for Anomalous Cosmic Rays and the Location of the Solar Wind Termination Shock. In: Proceedings of the 26th International Cosmic Ray Conference. Vol.7. International Union of Pure and Applied Physics , pp. 500-503.

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We use the observed relationship of the radial gradient of anomalous cosmic rays (ACRs), as measured in the outer heliosphere with instruments on the Voyager and Pioneer spacecraft, and the tilt of the heliospheric neutral current sheet to develop a model for the time dependence of ACRs at all radii near the helioequatorial plane. This phenomenological model reproduces the observations at 1 AU, Voyagers 1 and 2, and Pioneer 10 quite well. The model also indicates that the helioequatorial source intensity at the shock varies by a factor of 10, depending on solar magnetic polarity. The location of the solar wind termination shock during 1980-1990 is found to be 92 AU, with a best-fit of 84 AU.

Item Type:Book Section
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URLURL TypeDescription
Stone, E. C.0000-0002-2010-5462
Cummings, A. C.0000-0002-3840-7696
Additional Information:Copyright University of Utah. Provided by the NASA Astrophysics Data System. We thank W. Webber for providing PIO data. We thank the Wilcox Solar Observatory for the tilt data obtained through their website. We thank the ACE/SIS teani for the ACR 0 intensities. This work was supported by NASA under contract NAS7-918.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory19*99-05
Record Number:CaltechAUTHORS:20150211-090354763
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54695
Deposited By: Deborah Miles
Deposited On:13 Feb 2015 14:40
Last Modified:20 Feb 2020 14:33

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