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We report observations of an unpredicted fine structure in the activity
profile of the Leonid meteor storm of 1999 November 18. Our observations
were obtained at three widely separated sites (on the Iberian peninsula, in
Germany, and in Northern Sweden) and with two totally different techniques
(video cameras and meteor radars). The observations clearly show
quasi-periodic variations of the meteor rate with temporal separations of
individual maxima in the 6- to 9-min range. These temporal variations
translate into spatial variations within the dust trail with scales between
10000 and 30000 km, depending in which reference frame or direction one
chooses to compare. The times for the central three maxima as observed at
the three sites agree within 2 min of each other after application of the
appropriate topocentric time corrections. We consider a number of potential
causes for the observed density variations within the meteor stream.