In the sky over the Philippines noticed an unusual violet glow

Residents of the Philippines report that in the sky in recent days, there is a strange violet glow.
People post videos with this unusual phenomenon, which shows that these are not clouds lit by light from the earth, and the glow appears high in the sky.

However, recently such a violet glow has been observed in other parts of the globe, but so far no one has been able to explain its occurrence.