Astronomy Picture of the Day—木星北极的气旋

Discover the cosmos! Each day a different image or photograph of our fascinating universeis featured, along with a brief explanation written by a professional astronomer.

2018February 26

Cyclonesat Jupiter's North Pole

ImageCredit: NASA, JPL-Caltech, SwRI, ASI, INAF, JIRAM

Explanation:Juno's Jovian Infrared Auroral Mapper data was used to construct this stunningview of cyclones at Jupiter's North Pole. Measuring the thermal emission fromJovian cloud tops, the infrared observations are not restricted to thehemisphere illuminated by sunlight. They reveal eight cyclonic features thatsurround a cyclone about 4,000 kilometers in diameter, just offset from thegiant planet's geographic North Pole. Similar data show a cyclone at the JovianSouth Pole with five circumpolar cyclones. The South Pole cyclones are slightlylarger than their northern cousins. Cassini data has shown that gas giantSaturn's north and south poles each have a single cyclonic storm system.

木星北极的气旋

解释：朱诺飞船的木星红外冕制图数据被用来构建这幅木星北极气旋的影像。测量数据来自木星云端的热辐射。它们揭示出八个气旋特征，共同围绕着一个直径约4000公里的气旋，恰好出现在这颗巨行星的地理北极。相似的数据显示，木星南极具有5个绕极气旋。南极气旋比它们的兄弟北极气旋略大。卡西尼飞船的数据显示，气态巨行星土星的北极和南极都有一个气旋风暴系统。