The planet Venus is covered by thick clouds of sulfuric acid that move westwards because the entire upper atmosphere rotates much faster than the planet itself. At the cloud tops, about 65 km in altitude, small-scale features are predominantly carried by the background wind at speeds of approximately 100 m s−1. In contrast, planetary-scale atmospheric features have been observed to move slightly faster or slower than the background wind, a phenomenon that has been interpreted to reflect the propagation of planetary-scale waves. Here we report the detection of an interhemispheric bow-shaped structure stretching 10,000 km across at the cloud-top level of Venus in middle infrared and ultraviolet images from the Japanese orbiter Akatsuki. Over several days of observation, the bow-shaped structure remained relatively fixed in position above the highland on the slowly rotating surface, despite the background atmospheric super rotation. We suggest that the bow-shaped structure is the result of an atmospheric gravity wave generated in the lower atmosphere by mountain topography that then propagated upwards. Numerical simulations provide preliminary support for this interpretation, but the formation and propagation of a mountain gravity wave remain difficult to reconcile with assumed near-surface conditions on Venus. We suggest that winds in the deep atmosphere may be spatially or temporally more variable than previously thought.

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  1. 1.

    et al. Overview of Venus Orbiter, Akatsuki. Earth Planets Space 63, 443–457 (2011).

  2. 2.

    et al. LIR: Longwave Infrared Camera onboard the Venus Orbiter Akatsuki. Earth Planets Space 63, 1009–1018 (2011).

  3. 3.

    et al. Characteristic features in Venus’ nightside cloud-top temperature obtained by Akatsuki/LIR. Icarus 219, 502–504 (2012).

  4. 4.

    et al. in Venus (eds Hunten, D. M., Colin, L., Donahue, T. M. & Moroz, V. I.) 484–564 (Univ. Arizona Press, 1983).

  5. 5.

    et al. AKATSUKI returns to Venus. Earth Planets Space 68, 75 (2016).

  6. 6.

    et al. Longwave Infrared Camera onboard the Venus Climate Orbiter. Adv. Space Res. 40, 861–868 (2007).

  7. 7.

    et al. Cloud morphology and motions from Pioneer Venus images. J. Geophys. Res. 85, 8107–8128 (1980).

  8. 8.

    & Planetary-scale waves and the cyclic nature of cloud top dynamics on Venus. J. Atmos. Sci. 47, 293–318 (1990).

  9. 9.

    et al. Automated cloud tracking system for the Akatsuki Venus Climate Orbiter data. Icarus 217, 661–668 (2012).

  10. 10.

    & Improved automatic estimation of winds at the cloud top of Venus using superposition of cross-correlation surfaces. Icarus 271, 98–119 (2016).

  11. 11.

    et al. Influence of Venus topography on the zonal wind and UV albedo at cloud top level: the role of stationary gravity waves. J. Geophys. Res. 121, 1087–1101 (2016).

  12. 12.

    Turbulence and stress owing to gravity wave and tidal breakdown. J. Geophys. Res. 86, 9707–9714 (1981).

  13. 13.

    in Venus (eds Hunten, D. M., Colin, L., Donahue, T. M. & Moroz, V. I.) 681–765 (Univ. Arizona Press, 1983).

  14. 14.

    et al. Measurements of thermal structure and thermal contrasts in the atmosphere of Venus and related dynamical observations: results from the four Pioneer Venus probes. J. Geophys. Res. 85, 7903–7933 (1980).

  15. 15.

    Linear theory of stratified hydrostatic flow past an isolated mountain. Tellus 32, 348–364 (1980).

  16. 16.

    Meridional propagation of planetary-scale waves in vertical shear: implication for the Venus atmosphere. J. Atmos. Sci. 63, 1623–1636 (2006).

  17. 17.

    & Propagation of small-scale acoustic-gravity waves in the Venus atmosphere. J. Atmos. Sci. 41, 1202–1213 (1984).

  18. 18.

    Radiative forcing of the Venus mesosphere II. Thermal fluxes, cooling rates, and radiative equilibrium temperatures. Icarus 77, 391–413 (1989).

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We would like to acknowledge all the members of the Akatsuki project team for their efforts in the Akatsuki operation, which led to the successful VOI. This work was supported by JSPS KAKENHI Grant Numbers JP15K17767 and JP16H02231.

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  1. College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan

    • Tetsuya Fukuhara
    •  & Makoto Taguchi
  2. Omori Medical Center, Toho University, 6-11-1 Omorinishi, Ota-ku, Tokyo 143-8541, Japan

    • Masahiko Futaguchi
  3. Department of Earth Sciences, Okayama University, 3-1-1 Tsushimanaka, Kita-ku, Okayama 700-8530, Japan

    • George L. Hashimoto
  4. Faculty of Environmental Earth Science, Hokkaido University, N10W5, Sapporo, Hokkaido 060-0810, Japan

    • Takeshi Horinouchi
    •  & Mitsuteru Sato
  5. Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8561, Japan

    • Takeshi Imamura
  6. School of Commerce, Senshu University, 2-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8580, Japan

    • Naomoto Iwagaimi
  7. Artificial Intelligence Research Center, National Institute of Advanced Industrial Science and Technology, 2-3-26 Aomi, Koto-ku, Tokyo 135-0064, Japan

    • Toru Kouyama
  8. Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan

    • Shin-ya Murakami
    • , Masato Nakamura
    • , Takao M. Sato
    • , Makoto Suzuki
    •  & Atsushi Yamazaki
  9. School of Engineering, University of Shiga Prefecture, 2500 Hassaka, Hikone, Shiga 522-8533, Japan

    • Kazunori Ogohara
  10. Research and Information Center, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, Japan

    • Seiko Takagi
  11. Graduate School of Science, Kobe University, 7-1-48 Minatojima Minamimachi, Chuo-ku, Kobe, Hyogo 650-0047, Japan

    • Munetaka Ueno
  12. Space Information Center, Hokkaido Information University, Ebetsu, Hokkaido 069-8585, Japan

    • Shigeto Watanabe
  13. Planetary Exploration Research Center, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan

    • Manabu Yamada


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M.T. and S.W. are the principal investigators of LIR and UVI, respectively. T.F., M.F., G.L.H., T.I., N.I., T.K., M.N., M.S., T.M.S., M.S., S.T. and M.U. are co-investigators of LIR. M.Y. and A.Y. are co-investigators of UVI. T.H., S.-y.M. and K.O. contributed to the derivation of the wind field. T.I. contributed to the numerical modelling.

Competing interests

The authors declare no competing financial interests.

Corresponding author

Correspondence to Makoto Taguchi.

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