Observing Jupiter's "Blue Holes": Look for these enigmatic features along the edge of the planet's North Equatorial Belt.

This article from Sky & Telescope discusses the enigmatic features known as "Blue Holes" that can be observed along the edge of Jupiter's North Equatorial Belt. Jupiter's cloudscape is divided into bright zones and dusky belts, which are caused by differences in vertical motions and temperatures in the planet's upper atmosphere. The Blue Holes are areas where the ammonia-rich atmosphere expands and cools, forming white crystals of ammonia ice. The article also mentions the North Equatorial Dark Formations (NEDFs), which are contrasting markings located along the southern edge of the North Equatorial Belt. These features have a serrated appearance and can change rapidly in size and shape. The article concludes by discussing the reversal in atmospheric circulation patterns that occurred between 1908 and 1913, which remains a mystery. [Extracted from the article]