Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure and Dynamics of the 13/14 November 2012 Eclipse White-Light
  Corona   Continuing our series of observations of the motion and dynamics of the solar
corona over the solar-activity cycle, we observed the corona from sites in
Queensland, Australia, during the 13 (UT)/14 (local time) November 2012 total
solar eclipse. The corona took the low-ellipticity shape typical of solar
maximum (flattening index {\epsilon} = 0.01), showing a change from the
composite coronal images that we had observed and analyzed in this journal and
elsewhere for the 2006, 2008, 2009, and 2010 eclipses. After crossing the
northeast Australian coast, the rest of the path of totality was over the
ocean, so further totality was seen only by shipborne observers. Our results
include measurements of velocities of a coronal mass ejection; during the 36
minutes of passage from the Queensland coast to a ship north of New Zealand, we
find a speed of 413 km/s, and we analyze its dynamics. We discuss the shapes
and positions of several types of coronal features seen on our
higher-resolution composite Queensland images of the solar corona, including,
many helmet streamers, very faint bright and dark loops at the base of helmet
streamers, voids and radially oriented thin streamers. We compare our eclipse
observations with a hairy-ball model of the magnetic field, confirming the
validity of the prediction, and we relate the eclipse phenomenology seen with
the near-simultaneous images from the Atmospheric Imaging Assembly on the
NASA's Solar Dynamics Observatory (SDO/AIA), the Extreme Ultraviolet Imager on
NASA's Solar Terrestrial Relations Observatory (STEREO/EUVI), ESA/ROB's
PROBA2/SWAP, and NRL's LASCO on ESA's SOHO. For example, the southeastern CME
is related to the solar flare whose origin we trace with a SWAP series of
images.

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The categories of this paper are: chem-ph
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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: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: math-ph
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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: hep-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
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th