Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Magnetic Structure of Solar Prominence Cavities: New Observational
  Signature Revealed by Coronal Magnetometry   The Coronal Multi-channel Polarimeter (CoMP) obtains daily full-Sun
above-the-limb coronal observations in linear polarization, allowing for the
first time a diagnostic of the coronal magnetic field direction in quiescent
prominence cavities. We find that these cavities consistently possess a
characteristic "lagomorphic" signature in linear polarization indicating twist
or shear extending up into the cavity above the neutral line. We demonstrate
that such a signature may be explained by a magnetic flux-rope model, a
topology with implications for solar eruptions. We find corroborating evidence
for a flux rope structure in the pattern of concentric rings within cavities
seen in CoMP line-of-sight velocity.

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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: alg-geom
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: adap-org
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The categories of this paper are: econ
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol