Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014
Author(s)Burlaga, L. F.; Ness, N. F.; Richardson, John D
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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.
DepartmentKavli Institute for Astrophysics and Space Research
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
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