Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong Transverse Photosphere Magnetic Fields and Twist in Light Bridge
  Dividing Delta Sunspot of Active Region 12673   Solar Active Region (AR) 12673 is the most flare productive AR in the solar
cycle 24. It produced four X-class flares including the X9.3 flare on 06
September 2017 and the X8.2 limb event on 10 September. Sun and Norton (2017)
reported that this region had an unusual high rate of flux emergence, while
Huang et al. (2018) reported that the X9.3 flare had extremely strong
white-light flare emissions. Yang at al. (2017) described the detailed
morphological evolution of this AR. In this report, we focus on usual behaviors
of the light bridge (LB) dividing the delta configuration of this AR, namely
the strong magnetic fields (above 5500 G) in the LB and apparent photospheric
twist as shown in observations with a 0.1 arcsec spatial resolution obtained by
the 1.6m telescope at Big Bear Solar Observatory.

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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys