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Voyager Observations of Magnetic Fields and Cosmic Rays in the HeliosheathThe major features of the profile of greater than 70 MeV/nuc cosmic ray intensity (CRI) observed by Voyager 1 (VI) in the heliosheath from 2005.8-2010.24 are described by the empirical "CR-B" relation as the cumulative effect of variations of the magnetic field strength B. The CRI profile observed by Voyager 2 (V2) from 2008.60 to 2010.28 in the heliosheath is also described by the CR-B relation. On a smaller scale, of the order of a hundred days, a sequence on CRI decreases observed by V 1 during 2006 was interpreted as the effect of a propagating interplanetary shock first interacting with the termination shock, then moving past V1, and finally reflecting from the heliopause and propagating back to V1. Our observations show that the second CRI decrease in this sequence began during the passage of a "Global Merged Interaction Region" (GMIR), ~40 days after the arrival of the GMIR and its possible shock. The first and third CRI decreases in the sequence were associated with local enhancements of B. The magnetic field observations associated with the second sequence of 3 cosmic ray intensity decreases observed by V 1 in 2007/2008 are more difficult to reconcile with the scenario of Webber et al. (2009) and the CR-B relation. The discrepancy might indicate the importance of latitudinal effects
Document ID
20120014338
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Burlaga, L. F.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ness, N. F.
(Catholic Univ. of America Washington, DC, United States)
Stone, E.
(California Inst. of Tech. Pasadena, CA, United States)
McDonald, F. B.
(Maryland Univ. College Park, MD, United States)
Date Acquired
August 26, 2013
Publication Date
December 17, 2011
Publication Information
Publication: Journal of Geophysical Research
Volume: 116
Subject Category
Geophysics
Report/Patent Number
GSFC.JA.6872.2012
Funding Number(s)
CONTRACT_GRANT: NNX07AW09G
CONTRACT_GRANT: NNX09AT41G
Distribution Limits
Public
Copyright
Other

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