Red aurora are generated by light emitted at a longer wavelength (0.630 micrometers), and other colors such as blue and purple are also sometimes observed.

红色的极光是由较长波长(0.630微米)的发出光引起的，有时也会观察到其他诸如蓝色和紫色的极光。

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Red aurora are generated by light emitted at a longer wavelength (0.630 micrometers), and other colors such as blue and purple are also sometimes observed.

红色的极光是由较长波长(0.630微米)的发出光引起的，有时也会观察到其他诸如蓝色和紫色的极光。

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