Thousand of small celestial bodies fall annually on the earth, they are majority of small measurements and create the very known luminous phenomenon of THE FALLING STAR.
It is possible to observe this phenomenon outside of the visible window. Indeed the meteor when he penetrates in the atmosphere of the EARTH creates behind him a local ionization, that to the property to think the electromagnetic waves of the specter radio. It is possible to observe " the meteor indirectly " by the receipt of an echo radio on the ionized trail.
PRINCIPLE OF THE RADIO METEOR DETECTION
The transmitter are "visible" for the receptor (at right) only if the meteor reflect on is ionised trail.
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This echoes is not available on all frequency. He exists the low and high limits that depend on levels of ionization produces by the meteor. The speed of impact of the meteor and the mass condition the rate of ionization. More speed and mass = reflection to high frequencies is possible. the frequency used is 15 to 500 MHz. For more scientific description see IMO web site.
Indication here is for Europe. It is the frequencies presenting an interest in this type of monitoring.
For the Public :
The radio amateur band :