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Whistlers come from lightning-generated radio waves that leave earth’s atmosphere and travel into earth’s magnetosphere before bouncing back down.
嘯聲信號來自閃電產生的無線電波，這種電波離開了地球的大氣層，在重新反彈回來之前傳播進了地球的磁氣圈。
Not all radio waves do this and the sound they make, well, we call them whistlers because they sound like slowly descending tones.
不是所有的無線電波都會這么做，而它們發出的聲音，我們叫它們嘯聲信號是因為它們聽起來像緩慢下降的調子。
And no two whistlers are alike. To me, they’re the most intriguing.
任何兩個嘯聲信號都是不同的。對我來說它們是最有趣的。
Another interesting sound is the tweek.
另一個有趣的聲音是吱聲。
Tweeks are the result of VLF waves that have travelled a long distance through the waveguides.
吱聲是VLF電波的產物，這些電波借助波導穿過了很長的距離。
They produce a chirpy sound because the higher frequency parts of the wave reach the radio receiver before the lower frequency parts.
它們發出了一種活潑的聲音，因為這種電波較高頻次的部分比低頻次的部分更早到達無線電接收器。
The entire wave is still considered very low frequency.
但這整段電波仍被認為是非常低頻次的電波。
It’s just that some parts of the wave have lower frequencies than others, OK?
只是電波中的某些部分比其他的擁有更低的頻次。知道了嗎？
