An extended MHD study of the 16 October 2015 MMS diffusion region crossing

Cite as:
(2019). An extended MHD study of the 16 October 2015 MMS diffusion region crossing [Data set]. Princeton University.
  title       = {{An extended MHD study of the 16 October
                2015 MMS diffusion region crossing}},
  publisher   = {{Princeton University}},
  year        = 2019

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 3D 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, multi-fluid 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. 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 has difficulty resolving the lower hybrid drift instability, which has been observed to plays a fundamental role in heating and mixing electrons in the current layer.

Show More
# Filename Description Filesize
1 Fig1.tar 73.5 KB
2 Fig2.tar 161 MB
3 Fig3.tar 40.3 MB
4 Fig5.tar 10.2 MB
5 Fig6.tar 10.2 MB
6 Fig7.tar 101 MB
7 Fig8.tar 45.3 MB
8 Fig9.tar 101 MB
9 Fig10.tar 60 KB
10 Fig11.tar 32.2 MB
11 Fig13_14.tar 10.2 MB
12 InputFiles.tar 65.5 KB
13 ReadMe.txt 759 Bytes
14 Fig4.tar.bz2 1.91 GB
15 Fig12.tar.bz2 1.94 GB