This is a combination of the Skydomes “Northern Lights” and “Starlight Sky” to give a more vibrant starlight to compliment the aurorae.
32-bit starry sky mixed with 14-bit RAW's of Northern Lights. Please note that with the RAW's mixed in, the Northern Lights map could not be considered a true HDRI. Keeping this in mind, there is included a true 32-bit HDRI starry sky for extra flexibility in compositing, which is this file: https://www.cgtrader.com/3d-models/textures/natural/skydome-hdri-starlight-sky
Preview of the Northern Lights skydome: https://www.artstation.com/artwork/Qr2OD8