Dr Santiago Pérez-Hoyos, of the Planetary Science Group of the University of the Basque Country in Spain, is presenting the findings at the European Planetary Science Congress in Münster on Monday 22nd September.
“Our group has made an in-depth analysis of all the aspects regarding the history and evolution of Oval BA. The most strongly reddened region was an annulus around its centre. However, when we calibrated images taken with the Hubble Space Telescope, we found that it didn’t actually alter in red or infrared wavelengths during the period. Instead, it became darker in blue and ultraviolet wavelengths, which made it appear visually redder,” said Dr Pérez-Hoyos.
Oval BA was formed in 2000 by the merger of smaller vortices called the White Ovals in a chain of collisions that started back in 1998. The apparent reddening was first reported by amateur astronomers in early 2006, but it was not until April that professional astronomers were able to image the impressive alteration of the second largest storm in the Solar System after the Great Red Spot (GRS).
Using data from Cassini, the Hubble Space Telescope, NASA’s New Horizons mission and computer models the Planetary Science Group analysed possible causes for the colour change, including alterations to dynamical, photochemical and diffusion processes.
Dr Pérez-Hoyos said, “The most likely cause appears to be an upward and inward diffusion of either a coloured compound or a coating vapour that may interact later with high energy solar photons at the upper levels of Oval BA.”
Comparing Oval BA with the GRS, the group found that the GRS is still redder than BA, most likely because it is higher in Jupiter’s atmosphere, thicker and contains a higher concentration of the mysterious unknown chemical agents (cromophores) that give Jupiter its browny-red colour.
Oval or its white predecessors.
The group modelled the wind flow in detail using high resolution simulations, in order to understand why the red material may be confined to the annulus region and how the colour change happened in the observed time scales. The model accounts well for the temperature and wind structure inside the oval BA.
Models also showed that the change could not be attributed to interactions of Oval BA with the GRS, which were relatively close at the time. The flow around both vortices is in the zonal directions and is so strong that separates both storms.
The oval height did not change over the period and there were no large changes in the temperature gradient of the oval.
Dr Pérez-Hoyos said, “There is much to be understood about this problem yet. Future spacecraft missions and a continuous observation of the planet (as done by amateur astronomers) will surely give us new clues on the behaviour of Jupiter’s atmosphere that will result in a better understanding of it.”
IMAGESImages can be found at:
FURTHER INFORMATIONOval BA
4) improve public understanding of planetary environments.Europlanet Project website: http://europlanet.cesr.fr/
Anita Heward | alfa
APEX takes a glimpse into the heart of darkness
25.05.2018 | Max-Planck-Institut für Radioastronomie
First chip-scale broadband optical system that can sense molecules in the mid-IR
24.05.2018 | Columbia University School of Engineering and Applied Science
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
24.05.2018 | Ecology, The Environment and Conservation
24.05.2018 | Medical Engineering
24.05.2018 | Physics and Astronomy