Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Explosive magnetic reconnection caused by an X-shaped current-vortex
  layer in a collisionless plasma   A mechanism for explosive magnetic reconnection is investigated by analyzing
the nonlinear evolution of a collisionless tearing mode in a two-fluid model
that includes the effects of electron inertia and temperature. These effects
cooperatively enable a fast reconnection by forming an X-shaped current-vortex
layer centered at the reconnection point. A high-resolution simulation of this
model for an unprecedentedly small electron skin depth $d_e$ and ion-sound
gyroradius $\rho_s$, satisfying $d_e=\rho_s$, shows an explosive tendency for
nonlinear growth of the tearing mode, where it is newly found that the
explosive widening of the X-shaped layer occurs locally around the reconnection
point with the length of the X shape being shorter than the domain length and
the wavelength of the linear tearing mode. The reason for the onset of this
locally enhanced reconnection is explained theoretically by developing a novel
nonlinear and nonequilibrium inner solution that models the local X-shaped
layer, and then matching it to an outer solution that is approximated by a
linear tearing eigenmode with a shorter wavelength than the domain length. This
theoretical model proves that the local reconnection can release the magnetic
energy more efficiently than the global one and the estimated scaling of the
explosive growth rate agrees well with the simulation results.

34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org