Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Multilevel Observations of the Oscillations in the First Active Region
  of the New Cycle   For the first time, a multi-wave research of oscillation dynamics in a solar
facula from its birth to decay was carried out. We performed spectral
observations of active region NOAA 12744 at Horizontal Solar Telescope of the
Sayan Solar Observatory in the H$\alpha$, He I 10830 A, and Si I 10827 A lines.
We used Solar Dynamics Observatory (SDO) line-of-sight magnetic field data and
the 1600 A, 304 A, and 171 A UV channels. At the early stages of the facula
evolution, we observed low-frequency (1-2 mHz) oscillations concentrate in the
central part of the facula. In the lower solar atmosphere, this is registered
in the intensity, line-of-sight velocity, and magnetic field signals. These
frequencies were also observed in the transition region and corona (304 A and
171 A channels). At the maximal development phase of the facula evolution, the
low frequency oscillations closely reproduce the coronal loop structures
forming above the active region. At the decay phase, the spatial distributions
of the observed frequencies resemble those found in and above the undisturbed
chromosphere network. Our results indicate a direct relation of the low
frequency oscillations observed in the lower solar atmosphere with the
oscillations in the coronal loops, which is probably implemented through the
loop footpoints.

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The categories of this paper are: nlin
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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: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: econ
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th