Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014
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 peak...
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| Format: | Article |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/111994 |
| _version_ | 1826211013030051840 |
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| author | Burlaga, L. F. Ness, N. F. Richardson, John D. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Burlaga, L. F. Ness, N. F. Richardson, John D. |
| author_sort | Burlaga, L. F. |
| collection | MIT |
| description | 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. |
| first_indexed | 2024-09-23T14:59:02Z |
| format | Article |
| id | mit-1721.1/111994 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T14:59:02Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1119942022-10-01T23:47:38Z Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014 Burlaga, L. F. Ness, N. F. Richardson, John D. MIT Kavli Institute for Astrophysics and Space Research Richardson, John D 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. 2017-10-30T14:44:03Z 2017-10-30T14:44:03Z 2017-05 2017-04 2017-10-19T15:36:01Z Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-637X http://hdl.handle.net/1721.1/111994 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 http://dx.doi.org/10.3847/1538-4357/aa6f5c Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing IOP Publishing |
| spellingShingle | Burlaga, L. F. Ness, N. F. Richardson, John D. Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014 |
| title | Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014 |
| title_full | Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014 |
| title_fullStr | Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014 |
| title_full_unstemmed | Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014 |
| title_short | Transition from the Unipolar Region to the Sector Zone: Voyager 2, 2013 and 2014 |
| title_sort | transition from the unipolar region to the sector zone voyager 2 2013 and 2014 |
| url | http://hdl.handle.net/1721.1/111994 |
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