Fig. 9From: Survey of conditions for artificial aurora experiments at EISCAT Tromsø using dynasonde dataa Year-to-year variations in the number of possible days for conducting artificial aurora experiments from 2000 to 2017. The red bars indicate possible days, the gray bars indicate days in which conducting the experiments is not possible, and the black bars indicate days when there are no data. b Year-to-year variation in 1-year-averaged \(F_{10.7}\) from 2000 to 2017Back to article page