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Title: An Extended MHD Study of the 16 October 2015 MMS Diffusion Region Crossing

Abstract

The Magnetospheric Multiscale (MMS) mission has given us unprecedented access to high cadence particle and field data of magnetic reconnection at Earth's magnetopause. MMS first passed very near an X-line on 16 October 2015, the Burch event, and has since observed multiple X-line crossings. Subsequent 3-D particle-in-cell (PIC) modeling efforts of and comparison with the Burch event have revealed a host of novel physical insights concerning magnetic reconnection, turbulence-induced particle mixing, and secondary instabilities. In this study, we employ the Gkeyll simulation framework to study the Burch event with different classes of extended, multifluid magnetohydrodynamics (MHD), including models that incorporate important kinetic effects, such as the electron pressure tensor, with physics-based closure relations designed to capture linear Landau damping. Such fluid modeling approaches are able to capture different levels of kinetic physics in global simulations and are generally less costly than fully kinetic PIC. Herein we focus on the additional physics one can capture with increasing levels of fluid closure refinement via comparison with MMS data and existing PIC simulations. In particular, we find that the ten-moment model well captures the agyrotropic structure of the pressure tensor in the vicinity of the X-line and the magnitude of anisotropic electron heatingmore » observed in MMS and PIC simulations. However, the ten-moment model is found to have difficulty resolving the lower hybrid drift instability, which plays a fundamental role in heating and mixing electrons in the current layer.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [4];  [1]
  1. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Univ. of Maryland, College Park, MD (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); National Science Foundation (NSF)
OSTI Identifier:
1597982
Grant/Contract Number:  
AC02‐05CH11231; AGS‐1338944; AGS‐162230
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Space Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 11; Journal ID: ISSN 2169-9380
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; reconnection; extended MHD; turbulence; numerical modeling

Citation Formats

TenBarge, J. M., Ng, J., Juno, J., Wang, L., Hakim, A. H., and Bhattacharjee, A. An Extended MHD Study of the 16 October 2015 MMS Diffusion Region Crossing. United States: N. p., 2019. Web. doi:10.1029/2019JA026731.
TenBarge, J. M., Ng, J., Juno, J., Wang, L., Hakim, A. H., & Bhattacharjee, A. An Extended MHD Study of the 16 October 2015 MMS Diffusion Region Crossing. United States. doi:10.1029/2019JA026731.
TenBarge, J. M., Ng, J., Juno, J., Wang, L., Hakim, A. H., and Bhattacharjee, A. Mon . "An Extended MHD Study of the 16 October 2015 MMS Diffusion Region Crossing". United States. doi:10.1029/2019JA026731. https://www.osti.gov/servlets/purl/1597982.
@article{osti_1597982,
title = {An Extended MHD Study of the 16 October 2015 MMS Diffusion Region Crossing},
author = {TenBarge, J. M. and Ng, J. and Juno, J. and Wang, L. and Hakim, A. H. and Bhattacharjee, A.},
abstractNote = {The Magnetospheric Multiscale (MMS) mission has given us unprecedented access to high cadence particle and field data of magnetic reconnection at Earth's magnetopause. MMS first passed very near an X-line on 16 October 2015, the Burch event, and has since observed multiple X-line crossings. Subsequent 3-D particle-in-cell (PIC) modeling efforts of and comparison with the Burch event have revealed a host of novel physical insights concerning magnetic reconnection, turbulence-induced particle mixing, and secondary instabilities. In this study, we employ the Gkeyll simulation framework to study the Burch event with different classes of extended, multifluid magnetohydrodynamics (MHD), including models that incorporate important kinetic effects, such as the electron pressure tensor, with physics-based closure relations designed to capture linear Landau damping. Such fluid modeling approaches are able to capture different levels of kinetic physics in global simulations and are generally less costly than fully kinetic PIC. Herein we focus on the additional physics one can capture with increasing levels of fluid closure refinement via comparison with MMS data and existing PIC simulations. In particular, we find that the ten-moment model well captures the agyrotropic structure of the pressure tensor in the vicinity of the X-line and the magnitude of anisotropic electron heating observed in MMS and PIC simulations. However, the ten-moment model is found to have difficulty resolving the lower hybrid drift instability, which plays a fundamental role in heating and mixing electrons in the current layer.},
doi = {10.1029/2019JA026731},
journal = {Journal of Geophysical Research. Space Physics},
number = 11,
volume = 124,
place = {United States},
year = {2019},
month = {9}
}

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    Works referencing / citing this record:

    Global Ten‐Moment Multifluid Simulations of the Solar Wind Interaction with Mercury: From the Planetary Conducting Core to the Dynamic Magnetosphere
    journal, November 2019

    • Dong, Chuanfei; Wang, Liang; Hakim, Ammar
    • Geophysical Research Letters, Vol. 46, Issue 21
    • DOI: 10.1029/2019gl083180