The AUD/JPY currency pair, which expresses the value of the Australian dollar in terms of the Japanese yen, is a risk-on currency pair which tends to rise as global risk sentiment improves. The reverse is true; when risk sentiment falls, and especially as equity downside volatility Arises, AUD/JPY tends to fall (often more quickly other major FX pairs).
This relationship is helped both by tradition (traders using the pair to express their position on risk in markets) as well as by fundamentals; the Australian dollar is a commodity export due to Australia's commodity export exposures