Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetohydrodynamic with embedded particle-in-cell simulation of the
  Geospace Environment Modeling dayside kinetic processes challenge event   We use the MHD with embedded particle-in-cell model (MHD-EPIC) to study the
Geospace Environment Modeling (GEM) dayside kinetic processes challenge event
at 01:50-03:00 UT on 2015-11-18, when the magnetosphere was driven by a steady
southward IMF. In the MHD-EPIC simulation, the dayside magnetopause is covered
by a PIC code so that the dayside reconnection is properly handled. We compare
the magnetic fields and the plasma profiles of the magnetopause crossing with
the MMS3 spacecraft observations. Most variables match the observations well in
the magnetosphere, in the magnetosheath, and also during the current sheet
crossing. The MHD-EPIC simulation produces flux ropes, and we demonstrate that
some magnetic field and plasma features observed by the MMS3 spacecraft can be
reproduced by a flux rope crossing event. We use an algorithm to automatically
identify the reconnection sites from the simulation results. It turns out that
there are usually multiple X-lines at the magnetopause. By tracing the
locations of the X-lines, we find the typical moving speed of the X-line
endpoints is about 70~km/s, which is higher than but still comparable with the
ground-based observations.

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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: q-alg
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: quant-ph
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The categories of this paper are: stat