Figure S1. Ionospheric storm types for foF2 of training events #1 to #15. The solid black line is the observed data at the Jeju location during each event. The symbol lines indicate the 10-day average reference lines during quiet periods. The red and blue areas indicated a positive and negative storm. If the P/N ratio is greater than 1 in a specific event, the positive storm is the dominant one, and if it is less than 1, the negative storm is the dominant event.