
%0 Journal Article
%A Duncan, RA 
%T Photometric Observations of Subvisual Red Auroral Arcs at Middle Latitudes
%J Australian Journal of Physics
%D 1959/06/01
%V 12
%N 2
%P 197-198
%K 
%R https://doi.org/10.1071/PH590197
%U https://www.publish.csiro.au/paper/PH590197 
%X A photometer (Roach et aT. 1958) sensitive to the red oxygen emission at 6300 A has been in operation at Oamden, near Sydney (geomagnetic latitude 42°), since July 1958. In this period three bright aurorae have been seen in southern Australia; on July 8-9, September 4-5, and September 25-26. Following the first two the photometer detected a subvisual stable red arc the next night. On the night after the third aurora, observation was prevented by cloud. 
