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Title: ON MULTIPLE RECONNECTION X-LINES AND TRIPOLAR PERTURBATIONS OF STRONG GUIDE MAGNETIC FIELDS

Abstract

We report new multi-spacecraft Cluster observations of tripolar guide magnetic field perturbations at a solar wind reconnection exhaust in the presence of a guide field B{sub M} {sub  }which is almost four times as strong as the reversing field B{sub L}. The novel tripolar field consists of two narrow regions of depressed B{sub M}, with an observed 7%–14% ΔB{sub M} magnitude relative to the external field, which are found adjacent to a wide region of enhanced B{sub M} within the exhaust. A stronger reversing field is associated with each B{sub M} depression. A kinetic reconnection simulation for realistic solar wind conditions and the observed strong guide field reveals that tripolar magnetic fields preferentially form across current sheets in the presence of multiple X-lines as magnetic islands approach one another and merge into fewer and larger islands. The simulated ΔB{sub M}/ΔX{sub N} over the normal width ΔX{sub N} between a B{sub M} minimum and the edge of the external region agree with the normalized values observed by Cluster. We propose that a tripolar guide field perturbation may be used to identify candidate regions containing multiple X-lines and interacting magnetic islands at individual solar wind current sheets with a strong guide field.

Authors:
;  [1];  [2]; ;  [3];  [4];  [5];  [6];  [7];  [8]
  1. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO (United States)
  2. Center for Mathematical Plasma Astrophysics, Department of Mathematics, University of Leuven, Leuven (Belgium)
  3. Center for Integrated Plasma Studies, University of Colorado, Boulder, CO (United States)
  4. Space Sciences Laboratory, University of California, Berkeley, CA (United States)
  5. Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, Toulouse (France)
  6. Swedish Institute of Space Physics, Uppsala (Sweden)
  7. The Blackett Laboratory, Imperial College London, London (United Kingdom)
  8. High Performance Computing and Visualization Department, KTH, Stockholm (Sweden)
Publication Date:
OSTI Identifier:
22522405
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 805; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPUTERIZED SIMULATION; DISTURBANCES; HELIOSPHERE; MAGNETIC FIELDS; MAGNETIC ISLANDS; MAGNETIC RECONNECTION; PLASMA; SHEETS; SOLAR WIND; SPACE VEHICLES; SUN

Citation Formats

Eriksson, S., Gosling, J. T., Lapenta, G., Newman, D. L., Goldman, M. V., Phan, T. D., Lavraud, B., Khotyaintsev, Yu. V., Carr, C. M., and Markidis, S., E-mail: eriksson@lasp.colorado.edu. ON MULTIPLE RECONNECTION X-LINES AND TRIPOLAR PERTURBATIONS OF STRONG GUIDE MAGNETIC FIELDS. United States: N. p., 2015. Web. doi:10.1088/0004-637X/805/1/43.
Eriksson, S., Gosling, J. T., Lapenta, G., Newman, D. L., Goldman, M. V., Phan, T. D., Lavraud, B., Khotyaintsev, Yu. V., Carr, C. M., & Markidis, S., E-mail: eriksson@lasp.colorado.edu. ON MULTIPLE RECONNECTION X-LINES AND TRIPOLAR PERTURBATIONS OF STRONG GUIDE MAGNETIC FIELDS. United States. doi:10.1088/0004-637X/805/1/43.
Eriksson, S., Gosling, J. T., Lapenta, G., Newman, D. L., Goldman, M. V., Phan, T. D., Lavraud, B., Khotyaintsev, Yu. V., Carr, C. M., and Markidis, S., E-mail: eriksson@lasp.colorado.edu. Wed . "ON MULTIPLE RECONNECTION X-LINES AND TRIPOLAR PERTURBATIONS OF STRONG GUIDE MAGNETIC FIELDS". United States. doi:10.1088/0004-637X/805/1/43.
@article{osti_22522405,
title = {ON MULTIPLE RECONNECTION X-LINES AND TRIPOLAR PERTURBATIONS OF STRONG GUIDE MAGNETIC FIELDS},
author = {Eriksson, S. and Gosling, J. T. and Lapenta, G. and Newman, D. L. and Goldman, M. V. and Phan, T. D. and Lavraud, B. and Khotyaintsev, Yu. V. and Carr, C. M. and Markidis, S., E-mail: eriksson@lasp.colorado.edu},
abstractNote = {We report new multi-spacecraft Cluster observations of tripolar guide magnetic field perturbations at a solar wind reconnection exhaust in the presence of a guide field B{sub M} {sub  }which is almost four times as strong as the reversing field B{sub L}. The novel tripolar field consists of two narrow regions of depressed B{sub M}, with an observed 7%–14% ΔB{sub M} magnitude relative to the external field, which are found adjacent to a wide region of enhanced B{sub M} within the exhaust. A stronger reversing field is associated with each B{sub M} depression. A kinetic reconnection simulation for realistic solar wind conditions and the observed strong guide field reveals that tripolar magnetic fields preferentially form across current sheets in the presence of multiple X-lines as magnetic islands approach one another and merge into fewer and larger islands. The simulated ΔB{sub M}/ΔX{sub N} over the normal width ΔX{sub N} between a B{sub M} minimum and the edge of the external region agree with the normalized values observed by Cluster. We propose that a tripolar guide field perturbation may be used to identify candidate regions containing multiple X-lines and interacting magnetic islands at individual solar wind current sheets with a strong guide field.},
doi = {10.1088/0004-637X/805/1/43},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 805,
place = {United States},
year = {2015},
month = {5}
}