There doesn't seem to be a lot of information one the purple squiggles. Given that they're purple suggests that they're strong in SII and OIII but in RGB they're mostly blue which would make sense anyway given what the happens when you colour balance a SHO image.
That particular star is an A0 supergiant, quite similar to Rigel in luminosity and temperature. There are a few papers discussing whether or not HD 92207 is a variable magnetic field or not. If it isn't a variable then it is inaccuracy in detection and it's all still under research.
Given the presence of SII and OIII surrounding a blue supergiant, it isn't unusual for these kinds of stars to dredge up material from deep within and bring it towards the surface. With the potential of a variable magnetic field strength, that material could actually be an enormous solar flare that erupted at some stage but in that case you would definitely expect to see a lot of hydrogen.... which we don't.
https://academic.oup.com/mnras/artic...2/1779/1031499
In short, I have no idea and I'm struggling to find any papers on it either.