Out near the Pleiades Nebula in the HIP 17692 system is a small planet orbiting a ringed gas giant with a magma geyser field. I spent hours here driving around and checking out the location.
I found that day / night directly effects both the volume of magma being ejected from the geysers and the ferocity of the volcanism. It seems that night time cools the chambers and they tend to erupt less. Although at night, these geysers do look stunning.