Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chromospheric magnetic reconnection: Two-fluid simulations of coalescing
  current loops   Aims: To investigate magnetic reconnection rates during the coalescence of
two current loops in the solar chromosphere, by altering the neutral-hydrogen
to proton density ratio, ioniziation/recombination coefficients, collision
frequency and relative helicity of the loops. Methods: 2.5D numerical
simulations of the chromosphere were conducted using a newly developed
two-fluid (ion-neutral) numerical code. Developed from the Artificial Wind
scheme, the numerical code includes the effects of ion-neutral collisions,
ionization/recombination, thermal/resistive diffusivity and
collisional/resistive heating. Results: It was found that the rates of magnetic
reconnection strongly depend on the neutral-hydrogen to proton density ratio;
increasing the density ratio by a thousand-fold decreased the rate of magnetic
reconnection by twenty-fold. This result implies that magnetic reconnection
proceeds significantly faster in the upper chromosphere, where the density of
ions (protons) and neutral-hydrogen is comparable, than in the lower
chromosphere where the density of neutral-hydrogen is over a thousand times the
ion density. The inclusion of ionization/recombination, an important physics
effect in the chromosphere, increases the total reconnected magnetic flux, but
does not alter the rate of magnetic reconnection. Reductions in the ion-neutral
collision frequency, result in small increases to the rates of magnetic
reconnection. The relative helicity of the two current loops was not observed
to have any significant effect on the rates of magnetic reconnection.
Conclusions: The magnetic reconnection rates of coalescing current loops are
strongly affected by the inclusion of neutral-hydrogen particles.

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The categories of this paper are: eess
16
The categories of this paper are: stat
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: econ
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: hep-lat
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The categories of this paper are: comp-gas