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Title: On the Collisionless Asymmetric Magnetic Reconnection Rate

Abstract

A prediction of the steady state reconnection electric field in asymmetric reconnection is obtained by maximizing the reconnection rate as a function of the opening angle made by the upstream magnetic field on the weak magnetic field (magnetosheath) side. The prediction is within a factor of 2 of the widely examined asymmetric reconnection model (Cassak & Shay, 2007, https://doi.org/10.1063/1.2795630) in the collisionless limit, and they scale the same over a wide parameter regime. The previous model had the effective aspect ratio of the diffusion region as a free parameter, which simulations and observations suggest is on the order of 0.1, but the present model has no free parameters. In conjunction with the symmetric case (Liu et al., 2017, https://doi.org/10.1103/PhysRevLett.118.085101), this work further suggests that this nearly universal number 0.1, essentially the normalized fast-reconnection rate, is a geometrical factor arising from maximizing the reconnection rate within magnetohydrodynamic-scale constraints.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]
  1. Dartmouth College, Hanover, NH (United States)
  2. Univ. of Bergen (Norway); Southwest Research Inst. (SwRI), San Antonio, TX (United States)
  3. West Virginia Univ., Morgantown, WV (United States)
  4. Univ. of Delaware, Newark, DE (United States)
  5. Univ. of Maryland, College Park, MD (United States)
  6. Univ. of Maryland, College Park, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Publication Date:
Research Org.:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1537309
Alternate Identifier(s):
OSTI ID: 1433294
Grant/Contract Number:  
SC0016278
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 45; Journal Issue: 8; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Geology

Citation Formats

Liu, Yi-Hsin, Hesse, M., Cassak, P. A., Shay, M. A., Wang, S., and Chen, L. -J. On the Collisionless Asymmetric Magnetic Reconnection Rate. United States: N. p., 2018. Web. doi:10.1002/2017gl076460.
Liu, Yi-Hsin, Hesse, M., Cassak, P. A., Shay, M. A., Wang, S., & Chen, L. -J. On the Collisionless Asymmetric Magnetic Reconnection Rate. United States. doi:10.1002/2017gl076460.
Liu, Yi-Hsin, Hesse, M., Cassak, P. A., Shay, M. A., Wang, S., and Chen, L. -J. Tue . "On the Collisionless Asymmetric Magnetic Reconnection Rate". United States. doi:10.1002/2017gl076460. https://www.osti.gov/servlets/purl/1537309.
@article{osti_1537309,
title = {On the Collisionless Asymmetric Magnetic Reconnection Rate},
author = {Liu, Yi-Hsin and Hesse, M. and Cassak, P. A. and Shay, M. A. and Wang, S. and Chen, L. -J.},
abstractNote = {A prediction of the steady state reconnection electric field in asymmetric reconnection is obtained by maximizing the reconnection rate as a function of the opening angle made by the upstream magnetic field on the weak magnetic field (magnetosheath) side. The prediction is within a factor of 2 of the widely examined asymmetric reconnection model (Cassak & Shay, 2007, https://doi.org/10.1063/1.2795630) in the collisionless limit, and they scale the same over a wide parameter regime. The previous model had the effective aspect ratio of the diffusion region as a free parameter, which simulations and observations suggest is on the order of 0.1, but the present model has no free parameters. In conjunction with the symmetric case (Liu et al., 2017, https://doi.org/10.1103/PhysRevLett.118.085101), this work further suggests that this nearly universal number 0.1, essentially the normalized fast-reconnection rate, is a geometrical factor arising from maximizing the reconnection rate within magnetohydrodynamic-scale constraints.},
doi = {10.1002/2017gl076460},
journal = {Geophysical Research Letters},
number = 8,
volume = 45,
place = {United States},
year = {2018},
month = {3}
}

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