Tonight we should see the peak of this year's Geminid meteor shower. I wrote about the weird scientific mystery surrounding this particular meteor shower yesterday, and Miles O'Brien wrote a great feature on it for us today.
In the comments on my post yesterday, reader Clayton Yarbrough mentioned that meteors have an effect on radio signals, and I wanted to follow up on that, because it's a pretty cool phenomenon. Basically, meteors can allow you to send radio signals farther than is normally possible. In the video above, you can watch 7th grader Jeffrey Kelly interview a ham radio operator who explains how this works. But first a little background.
Radio waves travel through the air. You are, of course, aware of this. But there's also a limit to how far they can travel. Partly, this is because the radio waves move in what could be characterized as a straight line, but the planet Earth curves. To get around that bend in the horizon, ham operators frequently bounce their signals off a part of Earth's upper atmosphere, called the ionosphere. What makes the ionosphere special? It's ionized, meaning the particles it's made of are electrically charged. That should give you all the background you need to follow along with the video.