BASE-LINE EFFECT ON THE FORWARD-SCATTER RADAR REFLECTIONS FROM METEORTRAINS

The influence of the baseline orientation on the rate of recorded mete or echoes has been shown from the observations carried out during the Lyrid meteor shower periods in 1992 and 1993 with receivers rectangula rly displaced from the transmitting station in Bologna with a baseline length of about 700 km. It is shown that the maximum echo rate preced es or occurs later than the shower radiant culminates (at heights of 8 0 degrees), favouring the 45 degrees radiant elevation and similar ang le between the radiant and the beam axis. The consequences of the meas ured effect on the meteor flux within the shower and sporadic radiant distribution is discussed.