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Anomalous cosmic rays in the distant heliosphere and the reversal of the Sun's magnetic polarity in Cycle 23

McDonald, F. B. and Stone, E. C. and Cummings, A. C. and Webber, W. R. and Heikkila, B. C. and Lal, N. (2007) Anomalous cosmic rays in the distant heliosphere and the reversal of the Sun's magnetic polarity in Cycle 23. Geophysical Research Letters, 34 (5). Art. No. L05105. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20150324-133810503

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Abstract

Beginning in early June 2001 and extending over a ∼3 month period the Cosmic Ray Subsystem (CRS) experiment on Voyager 1 (80.3 AU, 34°N) observed a rapid transition in the energy of the peak intensity of anomalous cosmic ray (ACR) He from ∼11 MeV/n to ∼25 MeV/n. One month later there began a similar spectral shift at Voyager 2 (64.7 AU, 24°S). When these ACR transition times are extrapolated back from the estimated location of the heliospheric termination shock (TS) to the Sun (∼1 year) there is reasonable agreement with the range of times obtained for the polarity reversal of the interplanetary magnetic field (IPB) in the northern hemisphere near the Sun and the later reversal in the south. We interpret these changes in the ACR spectra as giving a global view of the interplanetary field reversal at the TS and confirmation of the important role of the TS in controlling the ACRs.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2006GL028932 DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/2006GL028932/abstractPublisherArticle
http://onlinelibrary.wiley.com/doi/10.1029/2006GL028932/suppinfoPublisherSupporting Information
ORCID:
AuthorORCID
Stone, E. C.0000-0002-2010-5462
Cummings, A. C.0000-0002-3840-7696
Additional Information:© 2007 by the American Geophysical Union. Received 28 November 2006; revised 5 January 2007; accepted 17 January 2007; published 7 March 2007. We thank Yi-Ming Wang of the Naval Research Laboratory, Washington, D.C., for valuable discussions. This work was supported by NASA under contract NAS7-03001.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAS7-03001
Subject Keywords:coronal holes; cosmic rays; energetic particles; heliopause; interplanetary magnetic fields
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2007-04
Issue or Number:5
Record Number:CaltechAUTHORS:20150324-133810503
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150324-133810503
Official Citation:McDonald, F. B., E. C. Stone, A. C. Cummings, W. R. Webber, B. C. Heikkila, and N. Lal (2007), Anomalous cosmic rays in the distant heliosphere and the reversal of the Sun's magnetic polarity in Cycle 23, Geophys. Res. Lett., 34, L05105, doi:10.1029/2006GL028932
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56034
Collection:CaltechAUTHORS
Deposited By: Deborah Miles
Deposited On:24 Mar 2015 22:20
Last Modified:20 Feb 2020 14:33

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