Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solar Corona Loop Studies with AIA: I. Cross-Sectional Temperature
  Structure   We present a first systematic study on the cross-sectional temperature
structure of coronal loops using the six coronal temperature filters of the
Atmospheric Imaging Assembly (AIA) instrument on the Solar Dynamics Observatory
(SDO). We analyze a sample of 100 loop snapshots measured at 10 different
locations and 10 different times in active region NOAA 11089 on 2010 July 24,
21:00-22:00 UT. The cross-sectional flux profiles are measured and a cospatial
background is subtracted in 6 filters in a temperature range of $T \approx
0.5-16$ MK, and 4 different parameterizations of differential emission measure
(DEM) distributions are fitted. We find that the reconstructed DEMs consist
predominantly of narrowband peak temperature components with a thermal width of
$\sigma_{log(T)} \le 0.11\pm0.02$, close to the temperature resolution limit of
the instrument, consistent with earlier triple-filter analysis from TRACE by
Aschwanden and Nightingale (2005) and from EIS/Hinode by Warren et al. (2008)
or Tripathi et al. (2009). We find that 66% of the loops could be fitted with a
narrowband single-Gaussian DEM model, and 19% with a DEM consisting of two
narrowband Gaussians (which mostly result from pairs of intersecting loops
along the same line-of-sight). The mostly isothermal loop DEMs allow us also to
derive an improved empirical response function of the AIA 94 \ang\ filter,
which needs to be boosted by a factor of $q_{94} = 6.7\pm 1.7$ for temperatures
at $log(T) \lapprox 6.3$. The main result of near-isothermal loop
cross-sections is not consistent with the predictions of standard nanoflare
scenarios, but can be explained by flare-like heating mechanisms that drive
chromospheric evaporation and upflows of heated plasma coherently over loop
cross-sections of $w \approx 2-4$ Mm.

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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: math
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The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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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: gr-qc
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
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The categories of this paper are: quant-ph