On 21st and 30th September 2022 people in La Paz, Bolivia and the surrounding area were treated to a spectacular display of solar halos. Conditions is the upper atmosphere must have been very stable as the halos were very bright and sustained, lasting for several hours from mid morning through to mid afternoon. As well as the more common 22º radius circular halo there was also a very bright infralateral or circumhorizon arc (possibly both during the course of the morning) below it and a clear parhelic circle (caused by the multiple reflection of light within ice crystals rather than refraction) overlapping the central halo. There may also have been a circumscribed halo, which almost overlaps the 22º halo when the sun is high in the sky; it is quite difficult to tell them apart. This gallery has a number of images of this rare display of atmospheric optics.
