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Original Caption Released with Image:PIA00124
This false-color image is a near-infrared map of lower-level clouds on the night side of Venus, obtained by the Near Infrared Mapping Spectrometer aboard the Galileo spacecraft as it approached the planet's night side on February 10, 1990. Bright slivers of sunlit high clouds are visible above and below the dark, glowing hemisphere. The spacecraft is about 100,000 kilometers (60,000 miles) above the planet. An infrared wavelength of 2.3 microns (about three times the longest wavelength visible to the human eye) was used. The map shows the turbulent, cloudy middle atmosphere some 50-55 kilometers (30- 33 miles) above the surface, 10-16 kilometers or 6-10 miles below the visible cloudtops. The red color represents the radiant heat from the lower atmosphere (about 400 degrees Fahrenheit) shining through the sulfuric acid clouds, which appear as much as 10 times darker than the bright gaps between clouds. This cloud layer is at about -30 degrees Fahrenheit, at a pressure about 1/2 Earth's surface atmospheric pressure. Near the equator, the clouds appear fluffy and blocky; farther north, they are stretched out into East-West filaments by winds estimated at more than 150 mph, while the poles are capped by thick clouds at this altitude.
PIA00124 Japanese
ガリレオにより1990/02/10に2.3ミクロンで撮影された。
この擬似カラーイメージは1990年2月10日に金星の夜側10万キロに接近したガリレオ探査機が2.3ミクロン赤外線で、Mapping Spectrometerによって得られたビーナスの低レベルの地図です。
太陽に照らされている昼半球は左上に砕片として写っており、暗く熱烈な半球側が見えています。
可視光で見える表面より10〜16km程下の、地表面から50-55数キロメートル(30- 33マイル)上の大気の様子を示します、
[NASA/JPL/Space Science Institute]
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