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Why Certain Clouds Glow Electric Blue at Night—And What They Reveal About the Upper Atmosphere

为何某些云层在夜间发出电蓝色辉光？它们揭示了高层大气的哪些秘密

Noctilucent clouds glow electric blue because they reflect sunlight from below the horizon.
They form near the mesosphere, about 80–85 km above Earth—far higher than normal clouds.
Their ice crystals are tiny, around 100 nanometers, and scatter blue light most efficiently.
These clouds only appear in summer near polar regions when upper-atmosphere temperatures drop below −120°C.
Scientists study them to track changes in atmospheric water vapor and methane levels.
An increase in sightings suggests cooling in the mesosphere, possibly linked to climate change.
They’re visible only when the sun is 6–16 degrees below the horizon—creating perfect twilight contrast.
Satellites like AIM (Aeronomy of Ice in the Mesosphere) map their seasonal spread and brightness.
Their presence also hints at increased rocket exhaust or meteoric dust seeding ice nucleation.
Monitoring them helps refine models of how Earth’s layers interact across extreme altitudes.

精读 · 大约 10 分钟

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

③ 学 · 重点表达

Noctilucent clouds glow electric blue because they reflect sunlight from below the horizon. 夜光云呈电蓝色，是因为它们反射地平线以下的阳光。
Scientists study them to track changes in atmospheric water vapor and methane levels. 科学家通过研究它们来追踪大气中水汽和甲烷含量的变化。
Monitoring them helps refine models of how Earth’s layers interact across extreme altitudes. 监测它们有助于完善地球各层在极高海拔处相互作用的模型。

④ 懂 · 选一选

这篇中文题目最接近哪一句？为何某些云层在夜间发出电蓝色辉光？它们揭示了高层大气的哪些秘密一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？夜光云呈电蓝色，是因为它们反射地平线以下的阳光。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） Why Certain Clouds Glow Electric Blue at Night—And What They Reveal About the Upper Atmosphere How to cook noodles A maths worksheet

⑤ 今天会说这一句

Noctilucent clouds glow electric blue because they reflect sunlight from below the horizon.

⑥ 跟读并录音

Noctilucent clouds glow electric blue because they reflect sunlight from below the horizon.

第一版：录下来、回听、再听标准音。系统打分以后再加。

⑦ 说 · 自己来一句

用今天的表达，自己说一句。

例子：Noctilucent clouds glow electric blue because they reflect sunlight from below the horizon.