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Inferring Energetic Particle Mean Free Paths from Observations of Anomalous Cosmic Rays in the Outer Heliosphere at Solar Maximum

Cummings, A. C. and Stone, E. C. (2001) Inferring Energetic Particle Mean Free Paths from Observations of Anomalous Cosmic Rays in the Outer Heliosphere at Solar Maximum. In: Proceedings of the 27th International Cosmic Ray Conference. Vol.10. Copernicus Systems and Technology GmbH , Berlin, Germany, pp. 4243-4246. http://resolver.caltech.edu/CaltechAUTHORS:20150302-111956144

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Abstract

We find that the mean free pathlength is higher by a factor of 10 or more at solar minimum than at the last solar maximum in 1900-1991, consistent with previous findings. In 2000-2001, the mean free pathlength has declined by a factor of ~10, but is still larger by a factor of ~3.6 than its value of ~0.15 AU in 1990-1991. As solar maximum conditions become durably established in the outer heliosphere over the next few months, it may be possible to deduce the radial dependence of the mean free pathlength.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/abs/2001ICRC...10.4243CADSArticle
Additional Information:© Copernicus GmbH. Provided by the NASA Astrophysics Data System This work was supported by NASA under contract NAS7-918. We thank the Wllcox Solar Observatory for the he-1 iospheric ti lt values (http://quake.stanford.edu/ wso/wso.html). We thank the MTT Space Plasma Group for supplying the daily averaged IMP-8 solar wind speeds (ftp://space.mit.edu/pub/plasma/imp/www/imp.html). We thank the ACE/SWEPAM team for supplying the ACE solar wind speeds (hltp://www.srl .cal tech .cdu/ ACE/ ASC/level2/i ndex .htm I).
Group:Space Radiation Laboratory
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Funding AgencyGrant Number
NASANAG7-918
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2001-16
Record Number:CaltechAUTHORS:20150302-111956144
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150302-111956144
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:55410
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:04 Mar 2015 05:22
Last Modified:04 Mar 2015 05:22

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