アメリカ内務省のインスタグラム(usinterior) - 2月18日 09時17分

When visiting #Alaska’s #Denali #NationalPark (@denalinps), be sure to look up for a chance to glimpse the #NorthernLights. Also known as the #auroraborealis, these fantastic displays of color occur when a massive burst of solar wind and magnetic fields interact with Earth's atmosphere. Different colors depend on whether electrons collide with atoms of oxygen (red/green) and nitrogen (blue/purple) and the altitude at which these collisions occur. Photo courtesy of Carl Johnson (@arcticlight-ak). #usinterior #findyourpark

[BIHAKUEN]UVシールド(UVShield)

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