Voyager observations of magnetic fields and cosmic rays in the heliosheath

Details Voyager observations of magnetic fields and cosmic rays in the heliosheath Voyager observations of magnetic fields and cosmic rays in the heliosheath

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11612104b&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A12, CiteID A12104

Physics

1

Interplanetary Physics: Cosmic Rays, Interplanetary Physics: Heliosphere/Interstellar Medium Interactions, Interplanetary Physics: Interplanetary Magnetic Fields

Scientific paper

The major features of the profile of >70 MeV/nuc cosmic ray intensity (CRI) observed by Voyager 1 (V1) 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 of 3 CRI decreases observed by V1 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 V1 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.

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