紫外光晒出大红斑
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2015-01-20
UV Light Colors Great Red Spot
紫外光晒成大红斑
木星大红斑的独特红影到底是羞红脸？还是晒伤呢？
撰文/播音 李•比林斯（Lee Billings）
翻译 南の生
审校 李轩
When I say “Jupiter,” what comes to mind? Chances are, you pictured a banded orb of gas marked by a big red oval, the giant planet’s Great Red Spot.
说到“木星”，你想到了什么？很有可能你会描绘出一条带状气轨，上面镶着一颗大红卵，即巨星的大红斑。
Scientists have long known that the Great Red Spot is a huge whirling storm rising high above the surrounding cloudtops. But the reason for its reddish hue has been a mystery. One leading theory has been that red-colored compounds are swirling up from deeper down to tint the Spot, a bit like the blush from blood rushing to your cheeks. Now, new results presented at recent meeting of the American Astronomical Society are suggesting something different.
一直以来科学家只知道大红斑是一个高于周围云层的庞大气旋风暴。但为什么是红色始终是一个谜。一种主流理论认为是（木星云层下方的）红色化学物质从底部旋升至顶部染红了该斑，有点类似血液冲向面颊造成的脸红。最近，美国天文学会近期会议上展示的新成果给出了不同的解释。
Working at the NASA/Caltech Jet Propulsion Lab in Pasadena, California, researchers exposed two chemicals known to exist in Jupiter’s atmosphere—ammonia and acetylene—to levels of ultraviolet light like those found near the top of the planet’s atmosphere. The ammonia and acetylene turned a shade of red very similar to the Great Red Spot’s, as seen up-close by passing spacecraft.
在加利福尼亚州帕萨迪纳市的NASA（美国国家航空与宇宙航行局）/加州理工学院喷气推力实验室里，研究人员将木星大气层里已知存在的两种化学元素——氨和乙炔暴露在光强等级类似于该星大气顶层附近的紫外光下。氨和乙炔会转变成与大红斑颜色十分相近的红影，正如经过木星的航天器近距离观察所见。
But the lab compounds only matched the Spot’s color if on Jupiter they were confined to its highest cloud tops. If they were welling up from beneath and distributed through all of the Spot’s layers, the Spot would be a much more brilliant crimson hue than its present pale red color.
而用实验室化学物质进行颜色模拟说明，木星的红色物质应该是被限制在红斑最高云层的顶部。否则，如果红斑物质是自下方涌上并分散至各个斑层，那么红斑的颜色比现在的浅红应该更深红才对。
So it looks like UV light's effect means that Jupiter’s Great Red Spot is less like a blush—and more of a sunburn.
如此看来，紫外光的作用意味着木星可能不是羞红了脸，更有可能是晒伤。
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©2011- 版权所有：中国数字科技馆
未经书面许可任何人不得复制或镜像
京ICP备11000850号-1 京公网安备11010502039775号
信息网络传播视听节目许可证0111611号
国家科技基础条件平台
未经书面许可任何人不得复制或镜像
京ICP备11000850号-1
京公网安备11010502039775号 信息网络传播视听节目许可证0111611号
国家科技基础条件平台