New cross sections for electron impact excitation and quenching of the N2+ Meinel bands have been combined with recently determined transmission probabilities to yield altitude profiles of the Meinel bands relative to those for the N2+ first-negative system. Quenching of the Meinel bands is found to compete with radiative decay for altitudes less than 120 km, and the quenching height (the altitude at which one half of the excited molecules are collisionally deactivated) is found to be approximately 85 km. The calculated intensity of the Meinel band system relative to that of the first-negative system agrees reasonably well with the more recent auroral measurements.