Meteor showers have predictable yearly schedules...
http://www.amsmeteors.org/showers.html As a amateur radio operator, I use meteor showers to be able to make radio contacts with hams I wouldn't normally be able to under other propagational circumstances.
These meteors are generally no bigger than a grain of sand, but when they enter earth's atmosphere and begin to burn up in the higher regions of the ionisphere, they "ionize" that tiny strata where the burn trail is, causing radio signals in the 25 to 450 mHz range to go further than they normally would without the meteor ionization.
The Amateur Radio Relay League's 28 mHz 10 meter "contest" in December is set to coincide with an annual meteor shower, so that during years of low sunspot activity (like now), there is at least "some" chance at longer distance propagation using meteor contacts.
The skills it takes to make contacts under this kind of propagation is intense.
When you get a meteor "ping" you have to work FAST to exchange the required information...at best, you may have 45 to 50 seconds (at 28 mHz) before the meteor ionization is gone....fail to get it done means you very well might have a busted QSO that won't count in your score.
The next meteor might not have the same characteristics to the same geograpical area.
Some meteor showers have a low (meteors/hour) rate, like 15-30...some have upwards of 60 to 70.
You also have to be there at times when the shower will "peak".
73 de K5TEN
68ROX