Christon, S. P. and Stone, E. C. and Hoeksema, J. T.
(1986)
Evidence for a Latitudinal Gradient of the Cosmic Ray Intensity Associated with a Change in the Tilt of the Heliospheric Current Sheet.
Geophysical Research Letters, 13
(8).
pp. 777-780.
ISSN 0094-8276.
https://resolver.caltech.edu/CaltechAUTHORS:20140429-142718506
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Abstract
Since mid-1985, the average flux of >70 MeV/nucleon cosmic rays at Voyager 2 (r_2 ∼ 17 AU, Θ_2 ∼ 0°) has been ∼3-5% greater than that at Voyager 1 (r_1 ∼ 24 AU, Θ_1 ∼ 26°N). This is the first direct observation over such a large radial range in which the galactic cosmic ray flux closer to the sun is higher than the flux farther from the sun for an extended period of time. This observation is consistent with the presence of a negative latitudinal gradient G_Θ=−0.36 ± 0.05 (or −0.60 ± 0.08) %/deg, assuming a coexistent radial gradient G_r of 1 (or 2) %/AU. We suggest that the appearance of this persistent negative latitudinal gradient may be due to the abrupt, large decrease of the heliospheric current sheet tilt to ∼20° in early 1985.
| Item Type: | Article |
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| Contact Email Address: | dmiles@caltech.edu |
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| Additional Information: | Copyright 1986 by the American Geophysical Union.
(Received June 2, 1986; accepted June 23, 1986)
We are grateful to R.E. Vogt for
his contributions to the Cosmic Ray Subsystem on the
Voyager spacecraft. We appreciate the contributions of
the other Voyager Cosmic Ray Subsystem team
members consisting of scientists and engineers at the
California Institute of Technology, the Goddard Space
Flight Center, the University of Arizona, and the
University of New Hampshire. Work at Caltech was
supported in part by the National Aeronautics and
Space Administration under contract JPL 49-556-63120-0-2600 and under grant NGR 05-002-160. Work
at Stanford was supported in part by the National
Aeronautics and Space Administration under Grant
NGR5-020-559, the Office of Naval Research under contract N00014-76-C-0207, and the Atmospheric Sciences
Section of the National Science Foundation under
Grant ATM77-20580. |
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| Group: | Space Radiation Laboratory |
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| Funders: | | Funding Agency | Grant Number |
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| JPL | 49-556-63120-0-2600 | | NASA | NGR 05-002-160 | | NASA | NGR5-020-559 | | ONR | N00014-76-C-0207 | | NSF | ATM77-20580 |
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| Other Numbering System: | | Other Numbering System Name | Other Numbering System ID |
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| Space Radiation Laboratory | 1986-06 |
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| Issue or Number: | 8 |
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| Record Number: | CaltechAUTHORS:20140429-142718506 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140429-142718506 |
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| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
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| ID Code: | 45321 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
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| Deposited On: | 29 Apr 2014 22:26 |
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| Last Modified: | 20 Feb 2020 14:33 |
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