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> BBC > 【BBC纪录片】太阳之谜 >  第13课

【BBC纪录片】太阳之谜 第13期

所属教程:【BBC纪录片】太阳之谜

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xijijun

2016年05月21日

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When the sunspots disappeared something on the sun changed

太阳黑子消失时,太阳表面的变化导致

that cooled the Earth down.

地球温度降低

But it wasn't that the solar output changed.

改变的并不是太阳的输出量

No matter how many sunspots there are

不论表面有多少太阳黑子

the sun doesn't get any hotter or brighter.

太阳的热度和亮度都不会改变

So the spots must have another effect.

所以黑子一定还有别的影响

And to see it we need a different way to look at the sun.

想看清这种影响必须以不同方式来观察太阳

It's not just heat and light that that the sun

太阳对地球放射的

is throwing at the Earth.

不只是光和热

As every sunbather knows,there's ultraviolet light too.

热爱日光浴的人都知道,还有紫外线

Enough UV reaches the surface to burn our skin,

抵达地球的紫外线量足以灼伤我们的皮肤

but it is only fraction of the sun's UV output.

但这只占了太阳紫外线输出量的一小部分

The rest is filtered out by the atmosphere.

其他的都被大气层过滤掉了

It means we don't get a complete picture

这表示在地球无法看清

of the sun from the Earth.

太阳的全貌

To see the sun in all its glory you have to go into space.

想要一窥太阳的真面目必须进入太空

From here you can see the changing sun.

在太空才能看清千变万化的太阳

In the extreme UV the sunspots burn a brilliant white.

燃烧的太阳黑子在强烈的紫外线中呈白热状态

In the X-ray frequencies they look even more dramatic.

X光频率下的太阳黑子活动更戏剧化

Huge plumes of superheated gas spout from the spots.

大量的高热气体从太阳黑子喷出

When you're seeing the visible

一般用肉眼观察

you're really seeing the surface of the sun.

只看得到太阳的表面

But when you're seeing the ultraviolet

但是用紫外线或X光观察时

or the x-rays you're actually seeing that very hot atmosphere,

看到的是温度高达一百万度的

and that's about a million degrees,

高热气体

whereas the surface is about six thousand degrees.

而太阳表面的温度约为六千度

So you're seeing a different part of the sun

所以我们观察到的是太阳的不同部位

And you're seeing a part that's constantly changing.

看到的是不断变化的部位

These phenomenal displays of solar power

1970年代天空实验室的太空人

were only discovered in the 1970s,by the astronauts on Skylab.

发现了这种太阳力量的惊人展现

No-one had seen the sun like this before.

从来没有人看过像这样的太阳

Since then a number of Space telescopes have been deployed

之后科学家为了观察太阳

whose sole purpose is to look at the sun.

部署了好几架太空望远镜

The most used is Soho

其中使用最频繁的是简称为SOHO的

the Solar and Heliospheric Observatory.

太阳及日光层观测站

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