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每日一翻:UV Light Colors Great Red Spot

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.

当我说“木星”,脑海中会出现什么?很有可能,你描绘的是一个有亮带的球体的气体以大红色椭圆形标记的气体,这颗巨大行星的大红斑。

Scientists have long known that the Great Red Spot is a huge whirling storm rising high above the surrounding cloud tops. 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. [Kevin H. Baines, Robert W. Carlson and Thomas W. Momary, Why is the Great Red Spot Red? The Exogenic, Photolytic Origin of the UV/Blue-Absorbing Chromophores of Jupiter’s Great Red Spot as Determined by Spectral Analysis of Cassini/VIMS Observations using New Laboratory Optical Coefficients]

科学家们早就知道,大红斑是一个云层周围上升的巨大的旋转风暴。但它为什么是红色的却一直是个谜。一个主要的理论认为红色化合物从颜色较深的下面旋转到上面,让斑点有了颜色,这有点像充血会让你的脸变红。现在,发表在美国天文学会会议上的新成果提出了一些不同的观点。

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.

工作在加利福尼亚州帕萨迪纳市的NASA-Caltech喷气推进实验室的研究员们揭示了两种在木星的大气中存在的化学物质——氨气和乙炔,像那些在木星大气层的顶端发现的气体。氨气和乙炔的红色阴影与通过宇宙飞船近距离看到的大红斑颜色相同,

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.

但实验室化合物只和木星上云层最高点的红斑的颜色匹配。如果它们从下面涌出而分布到红斑的所有层,斑点将会由之前的浅红色变成闪耀的深红色

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.

看来紫外线的影响意味着木星的大红斑不太像人们脸红脸红,而更像是晒伤。

—Lee Billings

 

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