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:

URL	URL Type	Description
http://dx.doi.org/10.1029/2006GL028932	DOI	Article
http://onlinelibrary.wiley.com/doi/10.1029/2006GL028932/abstract	Publisher	Article
http://onlinelibrary.wiley.com/doi/10.1029/2006GL028932/suppinfo	Publisher	Supporting Information

ORCID:

Author	ORCID
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 Agency	Grant Number
NASA	NAS7-03001

Subject Keywords:

coronal holes; cosmic rays; energetic particles; heliopause; interplanetary magnetic fields

Other Numbering System:

Other Numbering System Name	Other Numbering System ID
Space Radiation Laboratory	2007-04

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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

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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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