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Venus Has Extraordinarily Changeable And Extremely Large-scale Weather
ScienceDaily (Feb. 26, 2008) — Venus Express has revealed a planet of extraordinarily changeable and extremely large-scale weather. Bright hazes appear in a matter of days, reaching from the south pole to the low southern latitudes and disappearing just as quickly. Such ‘global weather’, unlike anything on Earth, has given scientists a new mystery to solve.
See also:
Space & Time
* Venus
* Solar System
* Sun
* Extrasolar Planets
* Astronomy
* Cosmic Rays
Reference
* Solar radiation
* Equatorial bulge
* Deimos (moon)
* Titan (moon)
The cloud-covered world of Venus is all but a featureless, unchangeable globe at visible wavelengths of light. Switch to the ultraviolet and it reveals a truly dynamic nature. Transient dark and bright markings stripe the planet, indicating regions where solar ultraviolet radiation is absorbed or reflected, respectively.
Venus Express watches the behaviour of the planet’s atmosphere with its Venus Monitoring Camera (VMC). It has seen some amazing things. In July 2007, VMC captured a series of images showing the development of the bright southern haze. Within days, the high-altitude veil continually brightened and dimmed, moving towards equatorial latitudes and back towards the pole again.
Such global weather suggests that fast dynamical, chemical and microphysical processes are at work on the planet. During these episodes, the brightness of the southern polar latitudes increased by about a third and faded just as quickly, as sulphuric acid particles coagulate.
“This bright haze layer is made of sulphuric acid,” says Dmitri Titov, VMC Co-Investigator and Venus Express Science Coordinator, Max Planck Institute for Solar System Research, Germany. That composition suggests the existence of a formation process to the VMC team.
At an altitude of about 70 km and below, Venus’s carbon dioxide-rich atmosphere contains small amounts of water vapour and gaseous sulphur dioxide. These are usually buried in the cloud layer that blocks our view of the surface at visible wavelengths.
However, if some atmospheric process lifts these molecules high up above the cloud tops, they are exposed to solar ultraviolet radiation. This breaks the molecules, making them highly reactive. The fragments find each other and combine quickly to form sulphuric acid particles, creating the haze.
“The process is a bit similar to what happens with urban smog over cities,” says Titov. With over 600 orbits completed, the VMC team now plan to look for repeating patterns of behaviour in the build-up and decrease of the haze layer.
What causes the water vapour and sulphur dioxide to well up in the first place? The team does not know yet. Titov says that it is probably an internal dynamical process in the planet’s atmosphere. Also, the influence of solar activity on haze formation has not been completely ruled out.
When the team have worked out what causes the hazes and their vigorous dynamics, there is still another problem waiting to be solved. The dark markings on these images are one of the biggest remaining mysteries of Venus’s atmosphere. They are caused by some chemical species, absorbing solar ultraviolet radiation. However, as yet, planetary scientists do not know the identity of the chemical. Now that they can spot these dark patches quickly with VMC, the team hopes to use another Venus Express instrument, VIRTIS, to pinpoint the exact chemical composition of these regions.
Adapted from materials provided by European Space Agency.
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European Space Agency (2008, February 26). Venus Has Extraordinarily Changeable And Extremely Large-scale Weather. ScienceDaily. Retrieved August 24, 2009, from http://www.sciencedaily.com /releases/2008/02/080221084148.htm
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This is a picture of Venus's atmosphere, taken by the Venus Monitoring Camera (VMC) during Venus Express orbit number 443 on 8 July 2007. The view shows the southern hemisphere of the planet. (Credit: ESA/ MPS/DLR/IDA)
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Related Stories
Venus Comes To Life At Wavelengths Invisible To Human Eyes (Dec. 5, 2008) — A pale yellow-green dot to the human eye, Earth's twin planet comes to life in the ultraviolet and the infrared. New images taken by instruments on board ESA's Venus Express provide insight into the ... > read more
Venus Express Reveals New Details On Venusian Clouds (June 5, 2008) — As ESA's Venus Express orbits our sister planet, new images of the cloud structure of one of the most enigmatic atmospheres of the Solar System reveal brand-new details. Venus is covered by a thick ... > read more
Double Vortex At Venus South Pole Unveiled (June 27, 2006) — ESA's Venus Express data undoubtedly confirm for the first time the presence of a huge 'double-eye' atmospheric vortex at the planet's south pole. This striking result comes from analysis of the data ... > read more
Unexpected Detail In First-ever Venus South Pole Images (Apr. 15, 2006) — The European Space Agency's Venus Express has returned the first-ever images of the hothouse planet's south pole from a distance of 206,452 kilometres, showing surprisingly clear structures and ... > read more
Happy Birthday, Venus Express! (Nov. 12, 2006) — One year after its launch on November 9, 2005, and a few months into its science phase, ESA's Venus Express keeps working well and continues to gather lots of data about the hot and noxious ... > read more
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Venus Has Extraordinarily Changeable And Extremely Large-scale Weather
ScienceDaily (Feb. 26, 2008) — Venus Express has revealed a planet of extraordinarily changeable and extremely large-scale weather. Bright hazes appear in a matter of days, reaching from the south pole to the low southern latitudes and disappearing just as quickly. Such ‘global weather’, unlike anything on Earth, has given scientists a new mystery to solve.
See also:
Space & Time
* Venus
* Solar System
* Sun
* Extrasolar Planets
* Astronomy
* Cosmic Rays
Reference
* Solar radiation
* Equatorial bulge
* Deimos (moon)
* Titan (moon)
The cloud-covered world of Venus is all but a featureless, unchangeable globe at visible wavelengths of light. Switch to the ultraviolet and it reveals a truly dynamic nature. Transient dark and bright markings stripe the planet, indicating regions where solar ultraviolet radiation is absorbed or reflected, respectively.
Venus Express watches the behaviour of the planet’s atmosphere with its Venus Monitoring Camera (VMC). It has seen some amazing things. In July 2007, VMC captured a series of images showing the development of the bright southern haze. Within days, the high-altitude veil continually brightened and dimmed, moving towards equatorial latitudes and back towards the pole again.
Such global weather suggests that fast dynamical, chemical and microphysical processes are at work on the planet. During these episodes, the brightness of the southern polar latitudes increased by about a third and faded just as quickly, as sulphuric acid particles coagulate.
“This bright haze layer is made of sulphuric acid,” says Dmitri Titov, VMC Co-Investigator and Venus Express Science Coordinator, Max Planck Institute for Solar System Research, Germany. That composition suggests the existence of a formation process to the VMC team.
At an altitude of about 70 km and below, Venus’s carbon dioxide-rich atmosphere contains small amounts of water vapour and gaseous sulphur dioxide. These are usually buried in the cloud layer that blocks our view of the surface at visible wavelengths.
However, if some atmospheric process lifts these molecules high up above the cloud tops, they are exposed to solar ultraviolet radiation. This breaks the molecules, making them highly reactive. The fragments find each other and combine quickly to form sulphuric acid particles, creating the haze.
“The process is a bit similar to what happens with urban smog over cities,” says Titov. With over 600 orbits completed, the VMC team now plan to look for repeating patterns of behaviour in the build-up and decrease of the haze layer.
What causes the water vapour and sulphur dioxide to well up in the first place? The team does not know yet. Titov says that it is probably an internal dynamical process in the planet’s atmosphere. Also, the influence of solar activity on haze formation has not been completely ruled out.
When the team have worked out what causes the hazes and their vigorous dynamics, there is still another problem waiting to be solved. The dark markings on these images are one of the biggest remaining mysteries of Venus’s atmosphere. They are caused by some chemical species, absorbing solar ultraviolet radiation. However, as yet, planetary scientists do not know the identity of the chemical. Now that they can spot these dark patches quickly with VMC, the team hopes to use another Venus Express instrument, VIRTIS, to pinpoint the exact chemical composition of these regions.
Adapted from materials provided by European Space Agency.
Email or share this story:
| More
Need to cite this story in your essay, paper, or report? Use one of the following formats:
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MLA
European Space Agency (2008, February 26). Venus Has Extraordinarily Changeable And Extremely Large-scale Weather. ScienceDaily. Retrieved August 24, 2009, from http://www.sciencedaily.com /releases/2008/02/080221084148.htm
enlarge
This is a picture of Venus's atmosphere, taken by the Venus Monitoring Camera (VMC) during Venus Express orbit number 443 on 8 July 2007. The view shows the southern hemisphere of the planet. (Credit: ESA/ MPS/DLR/IDA)
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www.da-design.fi
Moartea microscopica
Un virus necrutator ameninta femeile. Afla mai mult!
www.informarehpv.ro
Solar system, China
High Quality Solar Water Heater Contact us, For Wholesale, Buy now!
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Pyranometers and Dataloggers UVA, UVB, UVA+UVB spectrums
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Related Stories
Venus Comes To Life At Wavelengths Invisible To Human Eyes (Dec. 5, 2008) — A pale yellow-green dot to the human eye, Earth's twin planet comes to life in the ultraviolet and the infrared. New images taken by instruments on board ESA's Venus Express provide insight into the ... > read more
Venus Express Reveals New Details On Venusian Clouds (June 5, 2008) — As ESA's Venus Express orbits our sister planet, new images of the cloud structure of one of the most enigmatic atmospheres of the Solar System reveal brand-new details. Venus is covered by a thick ... > read more
Double Vortex At Venus South Pole Unveiled (June 27, 2006) — ESA's Venus Express data undoubtedly confirm for the first time the presence of a huge 'double-eye' atmospheric vortex at the planet's south pole. This striking result comes from analysis of the data ... > read more
Unexpected Detail In First-ever Venus South Pole Images (Apr. 15, 2006) — The European Space Agency's Venus Express has returned the first-ever images of the hothouse planet's south pole from a distance of 206,452 kilometres, showing surprisingly clear structures and ... > read more
Happy Birthday, Venus Express! (Nov. 12, 2006) — One year after its launch on November 9, 2005, and a few months into its science phase, ESA's Venus Express keeps working well and continues to gather lots of data about the hot and noxious ... > read more
Search ScienceDaily
Number of stories in archives: 44,032
Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily's archives for related news topics,
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Discover Quality Solar Water Heater Contact Manufacturers For Export
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Int. Diabetes Monitor
A free online review journal on trends in clinical diabetes.
InternationalDiabetesMonitor.com
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Information on Levemir® for health care professionals.
www.NovoNordisk.com
Just In:
Bioluminescent 'Green Bombers' From The Deep
People Really Do Walk In Circles With No Guide
Earliest Complex Organisms Fed By Ocean Buffet
'Microneedle' Patch May Take Sting Out Of Shots
Gene Links Physical Pain And Social Rejection
Plastics In Oceans Release Hazardous Chemicals
Electrical Conductivity Of Earth's Mantle
Galaxies Demand A Stellar Recount
Galaxies Demand A Stellar Recount
Science Video News
Finding Double Stars
Astronomers say that this July planetary orbits have lined up so that people on Earth can see a rare convergence of Venus and Saturn in the night. ... > full story
* Astronomers Spy Earth-like Planet Forming Around Distant Star
* Geographers Calculate Atmospheric Effects On Humans
* Planetary Scientists Detect Strong Winds In Anticyclone On Jupiter
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* Karzai and rival claim victory in Afghan vote
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* Chechen rebels declare "economic war": website
* Chechen rebels say they blew up Russian dam
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* Bolt reigns supreme after 200m world mark
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