Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-latitude coronal holes, decaying active regions and global coronal
  magnetic structure   We study the relationship between decaying active region magnetic fields,
coronal holes and the global coronal magnetic structure using Global
Oscillations Network Group (GONG) synoptic magnetograms, Solar Terrestrial
RElations Observatory (STEREO) extreme ultra-violet (EUV) synoptic maps and
coronal potential-field source-surface (PFSS) models. We analyze 14 decaying
regions and associated coronal holes occurring between early 2007 and late
2010, four from cycle 23 and 10 from cycle 24. We investigate the relationship
between asymmetries in active regions' positive and negative magnetic
intensities, asymmetric magnetic decay rates, flux imbalances, global field
structure and coronal hole formation. Whereas new emerging active regions
caused changes in the large-scale coronal field, the coronal fields of the 14
decaying active regions only opened under the condition that the global coronal
structure remained almost unchanged. This was because the dominant
slowly-varying, low-order multipoles prevented opposing-polarity fields from
opening and the remnant active-region flux preserved the regions' low-order
multipole moments long after the regions had decayed. Thus the polarity of each
coronal hole necessarily matched the polar field on the side of the streamer
belt where the corresponding active region decayed. For magnetically isolated
active regions initially located within the streamer belt, the more intense
polarity generally survived to form the hole. For non-isolated regions, flux
imbalance and topological asymmetry prompted the opposite to occur in some
cases.

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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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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: cond-mat
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The categories of this paper are: plasm-ph
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an