Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Venus wind map at cloud top level with the MTR/THEMIS visible
  spectrometer. I. Instrumental performance and first results   Solar light gets scattered at cloud top level in Venus' atmosphere, in the
visible range, which corresponds to the altitude of 67 km. We present Doppler
velocity measurements performed with the high resolution spectrometer MTR of
the Solar telescope THEMIS (Teide Observatory, Canary Island) on the sodium D2
solar line (5890 \AA). Observations lasted only 49 min because of cloudy
weather. However, we could assess the instrumental velocity sensitivity, 31 m/s
per pixel of 1 arcsec, and give a value of the amplitude of zonal wind at
equator at 151 +/- 16 m/s.

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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-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: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th