A meteoroid stream generally considered to be an elliptical ring of relatively small thickness. Such shape is attributable to meteoroid streams in an early stage of their evolution. Differences in planetary perturbations influencing the meteoroid particles ejected from the parent body from various points in its orbit at different velocities and time can result in a significant thickening
of the stream. Our studies on the evolution of the short-period meteoroid streams have shown that these streams can produce several couples of showers active indifferent seasons of the year.