Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron density of active region outflows measured by the EUV Imaging
  Spectrometer onboard Hinode   In order to better understand the nature of active region outflows, the
electron density was measured by using a density-sensitive line pair Fe xiv
264.78A/274.20A.Since coronal line profiles of the outflow region are composed
of a major component with a Doppler shift of < 10 km s^-1 and a minor component
(enhanced blue wing: EBW) blueshifted by up to 100 km s^-1, we extracted EBW
from the line profiles through double-Gaussian fitting. We tried applying the
simultaneous fitting to those two Fe xiv lines with several physical
restrictions. Electron density for both components (n_Major and n_EBW,
respectively) was calculated by referring to the theoretical intensity ratio as
a function of electron density as per the CHIANTI database. We studied six
locations in the outflow regions around NOAA AR10978. The average electron
density was n_Major = 10^(9.16 +- 0.16) cm^-3 and n_EBW = 10^(8.74 +- 0.29)
cm^-3. The magnitude relationship between n_Major and n_EBW was opposite in the
eastern and western outflow regions. The column depth was also calculated for
each component, which leads to the result that the outflows possess only a
small fraction (~ 0.1) in the eastern region, while they dominate over the
major component in the line profiles by a factor of five in the western region.
When taking into account the extending coronal structures, the western region
can be thought to represent the mass leakage. In contrast, we suggest a
possibility that the eastern region actually contributes to the mass supply to
coronal loops.

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The categories of this paper are: physics
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The categories of this paper are: funct-an
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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: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: cond-mat
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The categories of this paper are: econ
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The categories of this paper are: ao-sci