The effective recombination coefficient (α eff) of the nighttime ionoshpere has been deduced from the decay of the electron density measured by the impedance probe on board the S-310-3 rocket. α eff were 0.77～1.1×10^<-7>cm^3 sec^<-1> in the height range of 170km to 180km and 1.9×10^<-7>cm^3 sec^<-1> at the height of 130km. These value were in agreement with the result measured by the laboratory experiment taking account of the electron temperature. Since the ionospheric charged particle are drifted downward by the neutral atmospheric wind above the height of the intermediate layer, α eff should be corrected to be larger value than that estimated without the consideration of the effect of the dynamical transportation. The ionospheric α eff were examined being compared with the characteristics obtained by M. A. Biondi as a function of the electron temperature.
インピーダンスプローブによる電離層の有効再結合係数の観測
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