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Estimate of the Distance to the Solar Wind Termination Shock from Gradients of Anomalous Cosmic Ray Oxygen

Cummings, A. C. and Webber, W. R. and Stone, E. C. (1993) Estimate of the Distance to the Solar Wind Termination Shock from Gradients of Anomalous Cosmic Ray Oxygen. Journal of Geophysical Research B, 98 (A9). 15,165-15,168. ISSN 0148-0227. doi:10.1029/93JA01173.

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The radial gradient of anomalous cosmic ray oxygen measured instantaneously between Voyager 2 and Pioneer 10 during 1985-1988 is correlated with the inferred tilt of the heliospheric neutral sheet. This is consistent with a simple model in which the radial gradient is related to the length of the neutral sheet between the two spacecraft. With this model we show that the radial gradient and the tilt of the neutral sheet near the solar wind termination shock can be inferred from the Voyager and Pioneer observations. By comparing the time history of the inferred tilt with that derived from solar observations, we estimate that the termination shock was at 62 +5/-7 AU at solar minimum in 1987. At solar maximum the shock should be located at about 90 AU due to the increased pressure of the solar wind.

Item Type:Article
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URLURL TypeDescription
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:Copyright 1993 by the American Geophysical Union. Received October 5, 1992; revised January 4, 1993; accepted December 3, 1992.) We are grateful to T. Hoeksema for providing the neutral sheet tilt data. This work was supported in part by NASA under contract NAS7-918 and grant NAGW-1919.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1993-23
Issue or Number:A9
Record Number:CaltechAUTHORS:20140516-103709418
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45799
Deposited By: Deborah Miles
Deposited On:28 May 2014 18:50
Last Modified:10 Nov 2021 17:16

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