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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. https://resolver.caltech.edu/CaltechAUTHORS:20140516-103709418

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Abstract

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
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/93JA01173DOIArticle
http://adsabs.harvard.edu/abs/1993JGR....9815165CADSAbstract
ORCID:
AuthorORCID
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
Funders:
Funding AgencyGrant Number
NASANAS7-918
NASANAGW-1919
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1993-23
Issue or Number:A9
Record Number:CaltechAUTHORS:20140516-103709418
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140516-103709418
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45799
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:28 May 2014 18:50
Last Modified:20 Feb 2020 14:33

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