MAVEN的紫外线火星
(原标题: MAVEN's Ultraviolet Mars)
2023-06-27
浏览次数: 13
这两张火星全景图是在紫外线波段拍摄的，超出了人类肉眼可见的光谱。由MAVEN航天器的成像紫外光谱仪于2022年7月（左）和2023年1月记录，三个原本不可见的紫外波段被映射为红色，绿色和蓝色。这种配色方案将这颗红色星球的表面特征呈现为棕褐色和绿色。雾和云呈现白色或蓝色，而高空臭氧呈现出引人注目的紫色色调。在左边，火星的南极冰盖底部是明亮的白色，但在南半球的夏季萎缩。在右边，北半球的极地地区被云层和大气臭氧所笼罩。自2014年以来，MAVEN一直在探索火星稀薄的上层大气、电离层及其与太阳和太阳风的相互作用。
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These two global views of Mars were captured at ultraviolet wavelengths, beyond the spectrum visible to human eyes. Recorded by the MAVEN spacecraft's Imaging Ultraviolet Spectrograph instrument in July 2022 (left) and January 2023, three otherwise invisible ultraviolet bands are mapped into red, green, and blue colors. That color scheme presents the Red Planet's surface features in shades of tan and green. Haze and clouds appear white or blue, while high altitude ozone takes on a dramatic purple hue. On the left, Mars' south polar ice cap is in brilliant white at the bottom but shrinking during the southern hemisphere's summer season. On the right, the northern hemisphere's polar region is seen shrouded in clouds and atmospheric ozone. Known to some as the Mars Atmosphere and Volatile EvolutioN spacecraft, MAVEN has been exploring Mars' tenuous upper atmosphere, ionosphere, and its interactions with the Sun and solar wind since 2014.