I have been shooting some northern light pictures myself using a DSLR camera and tripod. A few years ago when I had a little more time to do things like that.
Now a person in the North of Sweden took his iPhone 11 Pro and captured some northern lights using the night mode feature. The phone was hand held, and he tried different exposures between 3 – 10 seconds.
The pictures are unedited, and here is a link to his album: https://imgur.com/a/1wjoe31
You can see some digital noise in the images but its still pretty impressive.