Leonid meteor stream from Ondrejov radar observations in 1965-1967

Results of Ondrejov radar observations of Leonid meteor shower in 1965-1967 are presented. Observations performed during previous returns of Leonid meteor showers indicate that both in 1965 and 1966 the peak activity was observed at almost the same solar longitude near L-. = 235 degrees.17. The activity pattern in 1965 showed two well pronounced peaks separated by 23 hours where the second one seemed to be the principal. This is true both with respect to activity as well as the flux. Our observations indicate that the main outburst of this Leonid return occurred in 1966, the activity ratio to 1965 was 1.2 while the corresponding ratio in fluxes was 3.7. The 1967 activity is characterized by a large scatter of observed hourly echo counts fluctuating around 15 which is slightly above the level in the intermediate years of Leonid activity. The dependence of the radio echo duration on the velocity, radiant position, the height of maximum ionization and the mass of particular meteoroid is also presented.