LONDON (IT BOLTWISE) – Scientists have made significant progress in understanding the extreme winds on Venus. A new study suggests that a daily atmospheric tidal cycle plays a larger role in creating these winds than previously thought. This discovery could revolutionize the understanding not only of Venus, but also of other slowly rotating planets.
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Venus is known for its extreme weather conditions, far beyond what we experience on Earth. While a Category 5 hurricane is already considered extreme on Earth, the winds on Venus are much more intense. They reach speeds of over 100 meters per second and orbit the planet in just four Earth days, although Venus itself takes 243 Earth days to complete a full rotation. This so-called super rotation is a fascinating phenomenon that has fascinated scientists for a long time.
A new study by Lai et al. has now found evidence that a daily atmospheric tidal cycle driven by the sun’s heat plays a crucial role in creating these extreme winds. Previous research had focused primarily on semidiurnal tides, which occur twice daily. However, the current study shows that diurnal tides, which occur once per Venusian day, contribute significantly to the distribution of momentum in the atmosphere.
The researchers analyzed data collected between 2006 and 2022 by the European Space Agency’s Venus Express and the Japanese Space Agency’s Akatsuki satellites. These satellites studied Venus’ atmosphere by observing the diffraction of radio waves. In addition, the scientists simulated superrotation with a numerical model of Venus’ atmosphere to better understand the role of thermal tides.
These new findings could not only deepen our understanding of Venus’ winds, but also provide important clues for meteorological research on other slowly rotating planets. However, the researchers emphasize that further research is needed to fully clarify the exact contributions of diurnal tides. Nevertheless, this study represents an important step towards better understanding the complex dynamic processes in the atmosphere of Venus.
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