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Radial and Latitudinal Gradients of Anomalous Cosmic Ray Oxygen Throughout the Heliosphere

Cummings, A. C. and Blake, J. B. and Cummings, J. R. and Franz, M. and Hovestadt, D. and Klecker, B. and Mason, G. M. and Mazur, J. E. and Mewaldt, R. A. and Stone, E. C. and Webber, W. R. (1995) Radial and Latitudinal Gradients of Anomalous Cosmic Ray Oxygen Throughout the Heliosphere. In: Proceedings of the 24th International Cosmic Ray Conference. Vol.4. International Union of Pure and Applied Physics , pp. 461-464. http://resolver.caltech.edu/CaltechAUTHORS:20140616-163231974

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Abstract

We have used data from the SAMPEX. Ulysses, Voyager 1 (Vl), Voyager 2 (V2), and Pioneer 10 (PIO) spacecraft to determine the radial and latitudinal gradients of anomalous cosmic ray oxygen at 10 MeV/nuc during 1994 days 209 - 313. These five spacecraft cover radial distances from 1 AU (SAMPEX) to 61 AU (PIO) and latitudes to 80° S (Ulysses) and 33° N (Vl). We find that the radial gradient is a decreasing function of radial distance, -r^(-n) , with n = 0.7 ± 0.7. The large-scale radial gradient between the inner and outer heliosphere is much smaller than it was during the last solar minimum period in ~1987. The latitudinal gradient is small and positive, 2.1 ± 0.6 %/deg, as opposed to the large and negative latitudinal gradients found during 1987, but similar to the small positive latitudinal gradient reported in a similar study for 1993 and also similar to that measured during 1976 for anomalous cosmic ray helium. These observations confirm that effects of curvature and gradient drift in the large scale magnetic field of the Sun are important for establishing the three-dimensional intensity distributions of these particles in the heliosphere during periods of solar minimum conditions.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/full/1995ICRC....4..800CADSArticle
ORCID:
AuthorORCID
Mason, G. M.0000-0003-2169-9618
Additional Information:© IUPAP. Provided by the NASA Astrophysics Data System. This work was supported in part by NASA under contracts NAS7-918, NAS5-30704, JPL contract 958748, and Agreement 26979B. This work was also supported by the MPG and BMFT under grant numbers 010N1990, 500N87037, 500C90021, and 500N91050.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAS7-918
NASANAS5-30704
JPL958748
JPL26979B
Bundesministerium für Forschung und Technologie (BMFT)010N1990
Bundesministerium für Forschung und Technologie (BMFT)500N87037
Bundesministerium für Forschung und Technologie (BMFT)500C90021
Bundesministerium für Forschung und Technologie (BMFT)500N91050
Max Planck GesellschaftUNSPECIFIED
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1995-18
Record Number:CaltechAUTHORS:20140616-163231974
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140616-163231974
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46289
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:18 Jun 2014 05:14
Last Modified:14 Sep 2017 23:45

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