Fig. 6From: Survey of conditions for artificial aurora experiments by the second electron gyro-harmonic at EISCAT Tromsø using dynasonde dataMonth-to-month variations of the number of possible days for conducting artificial aurora experiments from 2012 to 2017 (from a to f). The red bars indicate the possible days, while the gray bars indicate days in which conducting the experiments is not possible, and the black bars indicate days when there are no dataBack to article page