Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectropolarimetery of umbral fine structures from Hinode: Evidence for
  magnetoconvection   We present spectropolarimetric analysis of umbral dots and a light bridge
fragment that show dark lanes in G-band images. Umbral dots show upflow as well
as associated positive Stokes V area asymmetry in their central parts. Larger
umbral dots show down flow patches in their surrounding parts that are
associated with negative Stokes V area asymmetry. Umbral dots show weaker
magnetic field in central part and higher magnetic field in peripheral area.
Umbral fine structures are much better visible in total circularly polarized
light than in continuum intensity. Umbral dots show a temperature deficit above
dark lanes. The magnetic field inclination show a cusp structure above umbral
dots and a light bridge fragment. We compare our observational findings with 3D
magnetohydrodynamic simulations.

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The categories of this paper are: mtrl-th
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
3
The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: q-fin
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: cond-mat
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The categories of this paper are: gr-qc