Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: p-modes in and away from a sunspot   A time series of GONG Dopplergrams for the period 10-14 May 1997 from Udaipur
and Big Bear sites has been used to measure the velocity fluctuations in the
sunspot (NOAA active region 8038) and quiet photosphere simultaneously. We
observe that the power of pre-dominant p-mode is reduced in the sunspot as
compared to quiet photosphere by 39-52% depending on the location of the
sunspot region on the solar disk. We also observe a relative peak frequency
deviation of p-modes in the sunspot, of the order of 80-310 $\mu$Hz, which
shows a linear dependence on the magnetic field gradient in the active region.
The maximum frequency deviation of 310 $\mu$Hz on 12 May appears to be an
influence of a long duration solar flare that occurred in this active region.
We interpret this relative peak frequency deviation as either due to power
re-distribution of p-modes in the sunspot or a consequence of frequency
modulation of these modes along the magnetic flux tubes due to rapidly varying
magnetic field structure.

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The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
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The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat