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Winds in Venus’ Lower Mesosphere

  • Thomas Widemann (a1) and Emmanuel Lellouch (a1)

Extract

Dynamics of Venus’ mesosphere (70-110 km) is characterized by the coexistence of two different wind regimes: (1) between 70 and 85 km the vertical amplitude decrease of Venus’ zonal retrograde super-rotation; (2) between 85 and 110 km, a stable, sub-solar to anti-solar (SSAS) flow, driven by solar EUV heating. On July 7-14, 2001 and July 31 – August 4, 2002 we observed Venus with the Aurélie spectrometer on the 1.5-m telescope at Observatoire de Haute-Provence, France. The spectra cover the visible 8660-8730 Å range, in the 5v 3 band of 12 C 16 O 2, at a resolving power of about 120,000. Seven regions were observed on Venus’ illuminated side at ~ 75° phase angle. About 28 lines from the P and R branches of the 5v 3 band were detected and used for wind velocity measurements with an accuracy of 15 to 25 ms-1.

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Proceedings of the International Astronomical Union
  • ISSN: -
  • EISSN: 1539-2996
  • URL: /core/journals/proceedings-of-the-international-astronomical-union
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