Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large-Amplitude Oscillation of an Erupting Filament as Seen in EUV,
  H-alpha and Microwave Observations   We present multiwavelength observations of a large-amplitude oscillation of a
polar crown filament on 15 October 2002. The oscillation occurred during the
slow rise (about 1 km/s) of the filament. It completed three cycles before
sudden acceleration and eruption. The oscillation and following eruption were
clearly seen in observations recorded by the Extreme-Ultraviolet Imaging
Telescope onboard SOHO. The oscillation was seen only in a part of the
filament, and it appears to be a standing oscillation rather than a propagating
wave. The period of oscillation was about two hours and did not change
significantly during the oscillation. We also identified the oscillation as a
"winking filament" in the H-alpha images taken by the Flare Monitoring
Telescope, and as a spatial displacement in 17 GHz microwave images from
Nobeyama Radio Heliograph (NoRH). The filament oscillation seems to be
triggered by magnetic reconnection between a filament barb and nearby emerging
magnetic flux as was evident from the MDI magnetogram observations. No flare
was observed to be associated with the onset of the oscillation. We also
discuss possible implications of the oscillation as a diagnostic tool for the
eruption mechanisms. We suggest that in the early phase of eruption a part of
the filament lost its equilibrium first, while the remaining part was still in
an equilibrium and oscillated.

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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol