Cummings, A. C. and Mewaldt, R. A. and Stone, E. C. and Webber, W. R.
(1990)
Radial and Latitudinal Gradients of Anomalous Cosmic-Ray Oxygen and Helium from 1 to ~41 AU.
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. 206-209.
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Abstract
We have used data from the IMP 8, Voyager 1 (VI), Voyager 2 (V2), Pioneer 11 (Pll), and Pioneer 10 (PIO) spacecraft. to determine the radial and latitudinal gradients of
anomalous cosmic ray oxygen in the energy range ~7 - 25 MeV/nuc and anomalous cosmic
ray helium in the energy range ~20- 25 MeV/nuc for a time period near minimum solar
modulation in 1987. We find that the radial gradients of both species are decreasing functions
of radial distance, r, approximately r^(-1) for oxygen and r^(-0.7) for helium. The
latitudinal gradient is large and negative, implying significant spherical asymmetry in the
heliospheric distribution of these particles.
| 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 Todd Hoeksema for providing the neutral sheet tilt data. This work was supported in part by
NASA under contracts NAS-7-918 and NAG 5-727 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 | 1989-21 |
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| Record Number: | CaltechAUTHORS:20140714-155936587 |
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| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140714-155936587 |
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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: | 47194 |
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| Collection: | CaltechAUTHORS |
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| Deposited By: |
Deborah Miles
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| Deposited On: | 21 Jul 2014 21:36 |
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| Last Modified: | 20 Feb 2020 14:33 |
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