Featured Research

from universities, journals, and other organizations

Venus Comes To Life At Wavelengths Invisible To Human Eyes

Date:
December 5, 2008
Source:
European Space Agency
Summary:
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 turbulent atmosphere of our neighboring planet.

Venus Monitoring Camera image taken in the ultraviolet (0.365 micrometres), from a distance of about 30 000 km.
Credit: ESA/MPS/DLR/IDA

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 turbulent atmosphere of our neighbouring planet.

Related Articles


Using Venus Express, it is possible to compare what the planet looks like in different wavelengths, giving scientists a powerful tool to study the physical conditions and dynamics of the planet’s atmosphere.

Observed in the ultraviolet, Venus shows numerous high-contrast features. The cause is the inhomogeneous distribution of a mysterious chemical in the atmosphere that absorbs ultraviolet light, creating the bright and dark zones.

The ultraviolet reveals the structure of the clouds and the dynamical conditions in the atmosphere, whereas the infrared provides information on the temperature and altitude of the cloud tops.

With data from Venus Express, scientists have learnt that the equatorial areas on Venus that appear dark in ultraviolet light are regions of relatively high temperature, where intense convection brings up dark material from below. In contrast, the bright regions at mid-latitudes are areas where the temperature in the atmosphere decreases with depth. The temperature reaches a minimum at the cloud tops suppressing vertical mixing. This annulus of cold air, nicknamed the ‘cold collar’, appears as a bright band in the ultraviolet images.

Observations in the infrared have been used to map the altitude of the cloud tops. Surprisingly, the clouds in both the dark tropics and the bright mid-latitudes are located at about the same height of about 72 km.

At 60 south, the cloud tops start to sink, reaching a minimum of about 64 km, and form a huge hurricane at the pole.

In this mosaic, the infrared image is overlaid on an ultraviolet image, bringing the giant hurricane’s eye at the planet’s south pole to life. Its centre is displaced from the pole and the whole structure measures about 2000 km across, rotating around the pole in about 2.5 days.

This study, carried out by D. Titov and colleagues has revealed that variable temperature and dynamical conditions at the Venus cloud tops are the cause of the global ultraviolet pattern.

But the exact chemical species that creates the high-contrast zones still remains elusive, and the search is on.


Story Source:

The above story is based on materials provided by European Space Agency. Note: Materials may be edited for content and length.


Journal Reference:

  1. D. Titov et al. Atmospheric structure and dynamics as the cause of ultraviolet markings in the clouds of Venus. Nature, 4 December 2008

Cite This Page:

European Space Agency. "Venus Comes To Life At Wavelengths Invisible To Human Eyes." ScienceDaily. ScienceDaily, 5 December 2008. <www.sciencedaily.com/releases/2008/12/081203133811.htm>.
European Space Agency. (2008, December 5). Venus Comes To Life At Wavelengths Invisible To Human Eyes. ScienceDaily. Retrieved March 27, 2015 from www.sciencedaily.com/releases/2008/12/081203133811.htm
European Space Agency. "Venus Comes To Life At Wavelengths Invisible To Human Eyes." ScienceDaily. www.sciencedaily.com/releases/2008/12/081203133811.htm (accessed March 27, 2015).

Share This


More From ScienceDaily



More Space & Time News

Friday, March 27, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Why So Many People Think NASA's Asteroid Mission Is A Waste

Why So Many People Think NASA's Asteroid Mission Is A Waste

Newsy (Mar. 27, 2015) The Asteroid Retrieval Mission announced this week bears little resemblance to its grand beginnings. Even NASA scientists are asking, "Why bother?" Video provided by Newsy
Powered by NewsLook.com
Supermassive Blackhole Detector Ready for Business

Supermassive Blackhole Detector Ready for Business

Reuters - Innovations Video Online (Mar. 25, 2015) Construction of the world&apos;s largest and most powerful observatory designed to detect and analyze gamma rays has been completed in Mexico. Gamma ray particles are considered the most energetic in the universe and scientists hope to use the observatory to learn more about the supernovas and black holes that produce them. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
Rocket Blasts Off Carrying U.S. Air Force GPS Satellite

Rocket Blasts Off Carrying U.S. Air Force GPS Satellite

Reuters - News Video Online (Mar. 25, 2015) A U.S. Air Force GPS IIF-9 satellite launches aboard a United Launch Alliance Delta IV rocket into semi-synchronous orbit. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Opportunity's Marathon: The Mars Rover Just Keeps Going

Opportunity's Marathon: The Mars Rover Just Keeps Going

Newsy (Mar. 24, 2015) NASA&apos;s Opportunity Mars Rover finished a full marathon, making it the first human creation to do a full 26.2 miles on another planet. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins