meteor stream

…move in confined streams (called meteor streams) around the Sun. The introduction of radar observation led to the discovery of new meteor showers—and thus of new meteor streams—that were invisible to the eye and to cameras because they came from radiants in the daytime sky. All told, about 2,000 showers…

…in the streams (commonly called meteor streams) are not uniform, the intensities of the showers can vary considerably from year to year.