Shower meteors are collections of particles all moving at the same velocity in well-defined orbits or streams around the sun. When earth's orbit intersects a meteor stream a meteor shower is observed. The streams intersect the earth's orbit at the same time each year. The paths of shower meteors appear to radiate from the same point. The constellation in which this point of divergence, or radiant, seems to lie is used in naming the meteor shower.
Meteors tend to move in the same direction of that of the earth and the planets.
Meteor arrivals are assumed to be independent of the previous arrivals and to satisfy Poisson statistics. The particle collides with the air molecules forming trails of positive ions and free electrons used to reflect the radio waves.