Perseid meteor stream: cross and longitudinal structures from radar observations

Results of 23 years of observations of the Perseid meteor shower by the Ond iejov meteor radar in the period 1958-1996 are presented. Activity profiles in four categories of echo durations differ slightly in the position of th e activity peak and other characteristics of the central core in the range of solar longitudes (Eq. 1950.0) 138.0 degrees less than or equal to L. les s than or equal to 140.5 degrees. Maximum activity of the central core is a llocated at L. = 139.17 degrees +/- 0.06 degrees in accordance with previou s studies. The variation ratio of the year-to-year shower activity along th e stream within the above L. limits was found to be 2.2:1. (C) 1999 Elsevie r Science Ltd. All rights reserved.