Fig. 1
From: Response of aurora candidates in the Chinese official histories to the space climate during 511–1876
Years and the 10-year moving average curve of 215 aurora candidates in China during 511–1876 CE. There are 7 solar minimums, low solar activities (LSA; blue bars), and 6 high solar activities (HSA; red bars). Years of the aurora candidates in all colors (cross symbols) as well as that in white (diamond symbols), red (red diamond symbols), blue (blue diamond symbols), and the other colors (black diamond symbols) are denoted