Monday , January 25 2021

Giant Streak Structure in Venus "Cloudtops & # 39; it was found

A Japanese research team has found a giant line structure on Venus cloud tops. The discovery is based on observations of Venus according to Japanese nuclear Akatsuki. The findings were published on January 9 in Nature Communications.

Unlike any other planet Venus Solar System. The whole planet is hidden from thick clouds of sulfuric acid between 45 km to 70 km. This thick skeleton has been analyzed by scientists as the "sister planet" of the Earth. Japanese researchers move forward.

The discovery of these giant traces began with the Japanese nuclear accident Akatsuki. Akatsuki, also known as Venus Climate Orbiter, is the Japanese Aerospace Exploration Agency (JAXA) mission. The spacecraft was in orbit around Venus from December 2015. On Venus night, the IR2 (Infrared 2) camera captured the massive massive line of the middle and bottom image of the camera. IR2's observational data were not high quality and, unfortunately, the camera did not work, so it is not possible to study more structures and avoid the problem of the type of line.

Venus JAXA's Akatsuki Nuclear Space Ultraviolet Courtesy. It is difficult to observe the thick atmosphere of the planet. Credit: JAXA / Akatsuki / ISAS / DART
Venus JAXA's Akatsuki Nuclear Space Ultraviolet Courtesy. It is difficult to observe the thick atmosphere of the planet. Credit: JAXA / Akatsuki / ISAS / DARTS / Damia Bouic

The Japanese team, assistant professor of the Hiroki Kashimura project (University of Kobe, Graduate School of Science) uses a AFES-Venus computer program to calculate Venus atmospheric simulations. The forecast of solar, storm and climate change is something that happens in the solar system. Akatsuki's simulations and observations hoped to reveal the nature of the planet's scales.

(Left) At the bottom of Venus clouds you can see the Akatsuki IR2 camera. Shiny pieces show the cloud cover is thin. The scale of the planet can be seen in dotted lines in dark lines. (Right) AFES-Venus simulations restructure the structure of the planet's scale structure. Shiny divides show great drops. (Partial editing of Nature Communications paper CC BY 4.0?

In Venus, simulations are a more important tool to understand what happens in the planet's atmosphere, because it is difficult to observe. Unfortunately, the difficulty of observing Venus confirms the simulations.

AFES-Venus was very successful. He has made a great success in the Venus atmosphere to play cool ice and polar temperatures. The Japanese team has also used a Japanese simulator from Japan's Maritime Earth Science and Technology (JAMSTEC) to create the highest simulation of the Simulation of Venus.

The group analyzed the simulations and found that they are affected by these giants. The lines are based on the relationship between two atmospheric phenomena. The main cause of this structure is a phenomenon related to the Sun's Weather: in jet polar currents.

Polar jet polar is formed in the middle and upper levels of the earth. The simulations carried out in this study show that the same thing happens in Venus. Both are formed by two-dimensional wind turbines of two major atmospheres on the planet. But in Venus, there's something else working on.

Planetary scaling structure formation mechanism. The giant whirlpools caused by Rossby's waves (left) are inserted into high-latitude streams and streams (right). In extended torrents, the linear convergence area is formed, the fall occurs and the clouds below are thin. Venus directs it to the west, so jet stream also goes westward.

The atmospheric wave that affects the distribution of large-scale fluxes and the rotational effect of the planet (Rossby's wave) at the lowest earth generates 60 degrees latitude in the equator across the equator. Venus is different than the Earth's rotation. It rotates in the opposite direction of the earth and slowly rotates: 243 to complete the Earth's rotation day to day.

When the whirlpools are added to Venus's polar planes, the whirlwinds bend and stretch, and the convergence zone between the north and south winds is formed as a line. The north-south wind that drives the convergence area is a major negative flow due to the structure of the planetary scale structure.

Venus's polar view of atmospheric atmospheric lines through the IR2 toolbar in the spacecraft. C is the southern polar view, and D is the north polar view. Picture: Kashimura et. al. 2019.

The study's observation is a successful combination of evidence and simulation. Venus's atmosphere is difficult to study, and most of the studies focused on two dimensions, from east to west. But this study adds a third dimension to understanding Venus.

The group behind the research is confident of its discovery, but they are not the whole image of the causes of false lines. As they say, "Although we have mentioned a scale-scale network formation mechanism, we should emphasize that the disorders, instability and angles of equilibrium momentum in our simulation are not yet clear."

They have said that the analysis is necessary to understand all the details of phenomena. "We need to understand the mechanisms for evaluating the robustness or sensitivity of the mechanism of the specific mechanisms that are present, but we will continue to carry out further research for future research."


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