Abstract
Reflection of radio waves from a meteor trail is mainly due to the first Fresnel zone, that is the section of the trail which lies across the foot of the perpendicular from the observer to the trail itself. In general, a radar eche does not give any evidence to the tract of maximum ionization along the same trail. This can be considered as a shortcoming of the radar technique for the exploration of the meteors, which otherwise is so fruitful. This paper shows that, under some specific conditions, even the reflection from the tract of maximum ionization can show up in a meteor echo. This possibility is quite significant, since the knowledge of the height at which the maximum ionization is located leads to the determination of β, the coefficient of meteoric ionization in the upper atmosphere.
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