Spectacular Halo in Austria
During our holidays in Austria, we could see a very nice halo. The 22°-halo could be seen very clearly. At the bottom of the halo, the Lower Tangent Arc was very bright, as well as the Upper Tangent Arc. These Tangent Arcs are already less frequent to see (according to the Atmospheric Optics website around 27 days per year in Europe). Above the Upper Tangent Arc, a fainter atmospheric effect was visible: The Parry Arc . The Parry Arc is a very rare sighting. On average, the arc is only visible once a year in Europe. However, after some discussions, there is probably a lens artefact at the location of the 'Parry Arc'. But even without this rare Parry Arc, it was still a very nice sighting. On August 19, we could see another very nice halo.