Antarctic Sightings of Noctilucent and Nacreous Clouds

Abstract

A REGULAR watch was kept for noctilucent clouds from February 1966 to February 1967 at the Australian National Antarctic Research Expedition's Station, Mawson (67.6° S., 62.9° E.). Noctilucent clouds were observed in the morning (bluish white waves and bands) and in the evening (bluish white, structureless) of August 11, and in the evening (faint blue bands) of August 14, 1966. These sightings met the necessary conditions for identification of noctilucent clouds given by Fogle1. Colour photographs were taken of the August 14 display. Nacreous clouds with marked irisation were observed on August 11, 13 and 14.