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Title: The reduction of magnetic reconnection outflow jets to sub-Alfvénic speeds

Abstract

The outflow velocity of jets produced by collisionless magnetic reconnection is shown to be reduced by the ion exhaust temperature in fully kinetic particle in cell simulations and in situ satellite observations. We derive a scaling relationship for the outflow velocity based on the upstream Alfvén speed and the parallel ion exhaust temperature, which is verified in kinetic simulations and observations. The outflow speed reduction is shown to be due to the firehose instability criterion, and so, for large enough guide fields, this effect is suppressed and the outflow speed reaches the upstream Alfvén speed based on the reconnecting component of the magnetic field.

Authors:
 [1]; ORCiD logo [2];  [2];  [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]
  1. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy; Univ. of Chicago, IL (United States). Dept. of Astronomy and Astrophysics
  2. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy
  3. Univ. of California, Berkeley, CA (United States). Space Sciences Lab.
  4. Univ. of Maryland, College Park, MD (United States). Inst. for Research in Electronics and Applied Physics
  5. Thammasat Univ., Pathum Thani (Thailand). Dept. of Physics
  6. West Virginia Univ., Morgantown, WV (United States). Dept. of Physics and Astronomy
  7. Univ. of Exeter, Exeter (United Kingdom). CGAFD, Mathematics, CEMPS,
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE
OSTI Identifier:
1543884
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 10; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
Physics

Citation Formats

Haggerty, Colby C., Shay, Michael A., Chasapis, Alexandros, Phan, Tai D., Drake, James F., Malakit, Kittipat, Cassak, Paul A., and Kieokaew, Rungployphan. The reduction of magnetic reconnection outflow jets to sub-Alfvénic speeds. United States: N. p., 2018. Web. doi:10.1063/1.5050530.
Haggerty, Colby C., Shay, Michael A., Chasapis, Alexandros, Phan, Tai D., Drake, James F., Malakit, Kittipat, Cassak, Paul A., & Kieokaew, Rungployphan. The reduction of magnetic reconnection outflow jets to sub-Alfvénic speeds. United States. doi:10.1063/1.5050530.
Haggerty, Colby C., Shay, Michael A., Chasapis, Alexandros, Phan, Tai D., Drake, James F., Malakit, Kittipat, Cassak, Paul A., and Kieokaew, Rungployphan. Wed . "The reduction of magnetic reconnection outflow jets to sub-Alfvénic speeds". United States. doi:10.1063/1.5050530. https://www.osti.gov/servlets/purl/1543884.
@article{osti_1543884,
title = {The reduction of magnetic reconnection outflow jets to sub-Alfvénic speeds},
author = {Haggerty, Colby C. and Shay, Michael A. and Chasapis, Alexandros and Phan, Tai D. and Drake, James F. and Malakit, Kittipat and Cassak, Paul A. and Kieokaew, Rungployphan},
abstractNote = {The outflow velocity of jets produced by collisionless magnetic reconnection is shown to be reduced by the ion exhaust temperature in fully kinetic particle in cell simulations and in situ satellite observations. We derive a scaling relationship for the outflow velocity based on the upstream Alfvén speed and the parallel ion exhaust temperature, which is verified in kinetic simulations and observations. The outflow speed reduction is shown to be due to the firehose instability criterion, and so, for large enough guide fields, this effect is suppressed and the outflow speed reaches the upstream Alfvén speed based on the reconnecting component of the magnetic field.},
doi = {10.1063/1.5050530},
journal = {Physics of Plasmas},
number = 10,
volume = 25,
place = {United States},
year = {2018},
month = {10}
}

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