Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prominence-cavity regions observed using SWAP 17.4 nm filtergrams and
  simultaneous eclipse flash spectra   SWAP images from PROBA2 taken at 174 {\AA} in the Fe IX/X lines are compared
with simultaneous slitless flash spectra obtained during the solar total
eclipse of 11 July, 2010. Myriads of faint low excitation emission lines
together with the He I and He II Paschen {\alpha} chromospheric lines are
recorded on eclipse spectra where regions of limb prominences are obtained with
space-borne imagers. We analyzed a deep flash spectrum obtained by summing 80
individual spectra to evaluate the intensity modulations of the continuum.
Intensity deficits are observed and measured at the prominences boundaries in
both eclipse and SWAP images. The prominence cavities interpreted as a relative
depression of plasma density, produced inside the corona surrounding the
prominences, and some intense heating occurring in these regions, are
discussed. Photometric measurements are shown at different scales and
different, spectrally narrow, intervals for both the prominences and the
coronal background.

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The categories of this paper are: comp-gas
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
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The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph