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Solar activity has been recorded as auroras or sunspots in various historicalsources. These records are of much importance for investigating both long-termsolar activities and extremely intense solar flares. In previous studies, theywere recorded as "vapor," "cloud," or "light," especially in orientalhistorical sources; however, the terminology was not discussed adequately andis still quite vague. In this paper, we suggest the possibility of "unusualrainbow" and "white rainbow" as candidates of historical auroras in orientalhistorical sources and examine if it is probable. This discovery will help usto make more comprehensive historical auroral catalogues and require us to addthese terms to auroral candidates in oriental historical sources.

"Unusual Rainbow and White Rainbow" A new auroral candidate in oriental historical sources