Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Peculiar Stationary EUV Wave Fronts in the eruption on 2011 May 11   We present and interpret the observations of extreme ultraviolet (EUV) waves
associated with a filament eruption on 2011 May 11.The filament eruption also
produces a small B-class two ribbon flare and a coronal mass ejection (CME).
The event is observed by the Solar Dynamic Observatory (SDO) with high
spatio-temporal resolution data recorded by Atmospheric Imaging Assembly (AIA).
As the filament erupts, we observe two types of EUV waves (slow and fast)
propagating outwards. The faster EUV wave has a propagation velocity of ~ 500
km/s and the slower EUV wave has an initial velocity of ~ 120 km/s. We report
for the first time that not only the slower EUV wave stops at a magnetic
separatrix to form bright stationary fronts, but also the faster EUV wave
transits a magnetic separatrix, leaving another stationary EUV front behind.

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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: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: chem-ph
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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: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th