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Distance to the Solar Wind Termination Shock and the Source Flux of Anomalous Cosmic Rays During 1986-1988

Cummings, A. C. and Stone, E. C. and Webber, W. R. (1994) Distance to the Solar Wind Termination Shock and the Source Flux of Anomalous Cosmic Rays During 1986-1988. Journal of Geophysical Research A, 99 (A6). pp. 11547-11552. ISSN 0148-0227. doi:10.1029/94JA00551.

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We use observations of the intensity of anomalous cosmic ray helium and oxygen in the outer heliosphere near the last solar minimum period, in conjunction with solar observations of the tilt of the neutral current sheet, to estimate that the solar wind termination shock was at 67 ± 5 AU during the time period 1986.7-1988.5. We find the source flux of anomalous cosmic rays at the shock to be 1.7 ± 0.3 (m² s sr MeV/nucleon)^(−1) for 7.1-17.1 MeV/nucleon anomalous cosmic ray oxygen and 4.3 ± 0.8 (m² s sr MeV/nucleon)^(−1) for 31-57 MeV/nucleon anomalous cosmic ray helium. We also estimate a source flux of anomalous cosmic ray hydrogen of 2.3 ± 0.6 (m² s sr MeV)^(−1) at 134 MeV. The resulting energy density of anomalous cosmic rays at the solar wind termination shock is ∼0.03 eV/cm³, approximately 2% of the energy density of the solar wind at 67 AU.

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 1994 by the American Geophysical Union. (Received October 22, 1993; revised January 21, 1994; accepted February 21, 1994.) We are grateful to J. T. Hoeksema for providing the neutral sheet tilt data in machine readable form. This work was supported in part by NASA under contract NAS7-918 and grant NAGW-1919. The Editor thanks L. A. Fisk and M. A. Forman for their assistance in evaluating this paper.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1993-37
Issue or Number:A6
Record Number:CaltechAUTHORS:20140520-100248179
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45842
Deposited By: Deborah Miles
Deposited On:28 May 2014 19:31
Last Modified:10 Nov 2021 17:17

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