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An asymmetric solar wind termination shock

Stone, Edward C. and Cummings, Alan C. and McDonald, Frank B. and Heikkila, Bryant C. and Lal, Nand and Webber, William R. (2008) An asymmetric solar wind termination shock. Nature, 454 (7200). pp. 71-74. ISSN 0028-0836. doi:10.1038/nature07022.

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Voyager 2 crossed the solar wind termination shock at 83.7 au in the southern hemisphere, ~10 au closer to the Sun than found by Voyager 1 in the north. This asymmetry could indicate an asymmetric pressure from an interstellar magnetic field, from transient-induced shock motion, or from the solar wind dynamic pressure. Here we report that the intensity of 4–5 MeV protons accelerated by the shock near Voyager 2 was three times that observed concurrently by Voyager 1, indicating differences in the shock at the two locations. (Companion papers report on the plasma, magnetic field, plasma-wave and lower energy particle observations at the shock.) Voyager 2 did not find the source of anomalous cosmic rays at the shock, suggesting that the source is elsewhere on the shock or in the heliosheath. The small intensity gradient of Galactic cosmic ray helium indicates that either the gradient is further out in the heliosheath or the local interstellar Galactic cosmic ray intensity is lower than expected.

Item Type:Article
Related URLs:
URLURL TypeDescription
Stone, Edward C.0000-0002-2010-5462
Cummings, Alan C.0000-0002-3840-7696
Additional Information:© 2008 Macmillan Publishers Limited. Received 21 February; accepted 15 April 2008. This work was supported by NASA (NAS7-03001).
Group:Space Radiation Laboratory
Funding AgencyGrant Number
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2008-03
Issue or Number:7200
Record Number:CaltechAUTHORS:20140827-095819459
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Official Citation:An asymmetric solar wind termination shock p71-74 Edward C. Stone, Alan C. Cummings, Frank B. McDonald, Bryant C. Heikkila, Nand Lal & William R. Webber doi:10.1038/nature07022
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48979
Deposited On:27 Aug 2014 17:50
Last Modified:10 Nov 2021 18:38

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