Measurements of aeronomic parameters made by the Atmosphere Explorer-C satellite are used to determine the recombination rate coefficient of N2+ in the ionosphere. The rate is found to increase significantly with decreasing electron density. Values obtained range from ~1.4¿10-7 to 3.8¿10-7 cm3s-1. This variation is explained in a preliminary way in terms of an increase in the rate coefficient with vibrational excitation. Thus, high electron densities depopulate high vibrational levels reducing the effective recombination rate, wheras, low electron densities result in an enhancement in the population of high vibrational levels, thus, increasing the effective recombination rate.