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Voyager Observations of Anomalous Cosmic Ray Gradients and the Role of Diffusion and Drifts in the Outer Heliosphere

Cummings, A. C. and Stone, E. C. (2003) Voyager Observations of Anomalous Cosmic Ray Gradients and the Role of Diffusion and Drifts in the Outer Heliosphere. In: Proceedings of the 28th International Cosmic Ray Conference. Vol.7. International Union of Applied Physics , Tokyo, Japan, pp. 25-28. https://resolver.caltech.edu/CaltechAUTHORS:20150403-085521517

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Abstract

We find that the diffusion mean free path at 1.5 GV inferred from the gradient of anomalous cosmic rays (ACRs) observed by Voyager 1 and 2 (V1 and V2) has an approximately linear radial distance dependence at solar maximum. At solar minimum the mean free path is a factor of 10 or more larger than at solar maximum. We find that the expected dependence on current sheet tilt of the ACR O V1/V2 gradient has not become evident as of early 2003, likely because the tilt has yet to decrease below ˜40° . It appears that from mid-2000 up to day 104 of 2003 diffusion is the dominant particle transport mechanism in the far outer heliosphere at 1.5 GV.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/abs/2003ICRC....7.3897CADSArticle
ORCID:
AuthorORCID
Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
Additional Information:Copyright Universal Academy Press Inc.
Group:Space Radiation Laboratory
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2003-39
Record Number:CaltechAUTHORS:20150403-085521517
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150403-085521517
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56332
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:05 Apr 2015 22:47
Last Modified:20 Feb 2020 14:33

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