Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014
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Burlaga_2017_ApJ_841_47.pdf
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Author(s)
Burlaga, L. F.
Ness, N. F.
Richardson, John D.
Date Issued
May 2017
Journal
Astrophysical Journal
Publisher
IOP Publishing
Citation
Burlaga, L. F. et al. “Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014.” The Astrophysical Journal 841, 1 (May 2017): 47 © 2017 The American Astronomical Society
Version
Final published version
Abstract
We discuss magnetic field and plasma observations of the heliosheath made by Voyager 2 (V2) during 2013 and 2014 near solar maximum. A transition from a unipolar region to a sector zone was observed in the azimuthal angle λ between ∼2012.45 and 2013.82. The distribution of λ was strongly singly peaked at 270°in the unipolar region and double peaked in the sector zone. The δ-distribution was strongly peaked in the unipolar region and very broad in the sector zone. The distribution of daily averages of the magnetic field strength B was Gaussian in the unipolar region and lognormal in the sector zone. The correlation function of B was exponential with an e-folding time of ∼5 days in both regions. The distribution of hourly increments of B was a Tsallis distribution with nonextensivity parameter q = 1.7 ± 0.04 in the unipolar region and q = 1.44 ± 0.12 in the sector zone. The CR-B relationship qualitatively describes the 2013 observations, but not the 2014 observations. A 40 km s -1 increase in the bulk speed associated with an increase in B near 2013.5 might have been produced by the merging of streams. A "D sheet" (a broad depression in B containing a current sheet moved past V2 from days 320 to 345, 2013. The R- and N-components of the plasma velocity changed across the current sheet.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.3847/1538-4357/aa6f5c
