Crazy colors in the sky at the end of blue hour/beginning of night

I'm going to have to try capturing star images like this again in the future! This is right at the end of blue hour, pointed north at Sylvan Lake, in Custer State Park, South Dakota. I have to emphasize that this is the color that I saw in-camera...a very slight white balance tweak was made in post, but no boosts to saturation, no local adjustments, nothing. I don't know if it matters, but I was out that night hoping for northern lights activity (KP 6).

IMAGE LINK: https://flic.kr/p/29WL​ruT

Daggah wrote in post #18713574
I'm going to have to try capturing star images like this again in the future! This is right at the end of blue hour, pointed north at Sylvan Lake, in Custer State Park, South Dakota. I have to emphasize that this is the color that I saw in-camera...a very slight white balance tweak was made in post, but no boosts to saturation, no local adjustments, nothing. I don't know if it matters, but I was out that night hoping for northern lights activity (KP 6).

IMAGE LINK: https://flic.kr/p/29WL​ruT
Colors of Nightfall by David Gevert, on Flickr

Beautiful color, very nice picture! Good thing you were out that night.