Cummings, A. C. and Stone, E. C. and Webber, W. R.
(1990)
Time Variation of Radial and Latitudinal Gradients of Anomalous Cosmic Ray Oxygen in the Outer Heliosphere.
In:
Proceedings of the 21st International Cosmic Ray Conference.
Vol.6.
Department of Physics and Mathematical Physics, The University of Adelaide
, Northfield, South Australia, pp. 190-193.
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Abstract
We have used data from the Voyager I (VI), Voyager 2 (V2), and Pioneer IO (PIO)
spacecraft to monitor the radial a.nd latitudinal gradients of anomalous cosmic ray oxygen
in the energy range 7.1 - 17.l MeV /nuc from 1984 to 1989. We find that the latitudinal
gradient varies from near zero value in 1984-85 to -5.5%/deg in mid-19871 returning to near
zero value by the end of 1988. The magnitude of the latitudinal gradient is inversely correlated
with the radial gradient. The variations in the radial and latitudinal gradients are
correlated with the tilt of the neutral sheet for tilts ≾30 °, as expected from a sim pie model
of particle propagation which includes curvature and gradient drifts in the large-scale
heliospheric magnetic field.
Item Type: | Book Section |
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Additional Information: | © Organizing Committee of the 21st Int. Cosmic Ray Conference. Provided by the NASA Astrophysics Data System.
We thank H. Mora.al for several stimulating discussions. We
are grateful to T. Hoeksema for providing the neutral sheet tilt data. This work. was supported
in part by NASA under contract NAS-7-918 and and grant NGR-05-002-160. |
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Group: | Space Radiation Laboratory |
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Funders: | Funding Agency | Grant Number |
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NASA | NAS-7-918 | NASA | NGR-05-002-160 |
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Other Numbering System: | Other Numbering System Name | Other Numbering System ID |
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Space Radiation Laboratory | 1989-18 |
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Record Number: | CaltechAUTHORS:20140708-163956095 |
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Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140708-163956095 |
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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: | 47089 |
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Collection: | CaltechAUTHORS |
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Deposited By: |
Deborah Miles
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Deposited On: | 21 Jul 2014 21:15 |
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Last Modified: | 20 Feb 2020 14:33 |
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