Time used	Source data period	Source data media	Source data location	Published data period	Published data media	Published data location	Comments
Time changed to UT at 1000/182 in 1986. Prior to that date all data on 150 EMT	12/45-11/51	Nitrate file	IPS station either Camden or Canberra	12/45-12/70	Published in data books	NSW Archives
	09/11/51-01/67	35mm film	NSW Archives	01/71-12/80	Computer printout	No copies kept
	02/06/77-20/12/96	16mm film	IPS Sydney	1981-2000	Microfiche	IPS Sydney	Spares not available for all years
	02/06/94-present	Digital	IPS Sydney
	28/02/94-15/09/01	4d raw and clean digital data	IPS Sydney
	09/01/91-17/04/97	5a clean digital data	IPS Sydney				Clean data only.
	17/08/98-present	5d raw and clean digital data	IPS Sydney
	21/08/98-present	Cadi raw and clean digital data	IPS Sydney
	01/01/50-	Digital data for all scaled parameters	IPS Sydney				Up to about one year ago. Median data from 12/45.
	Keyed in data
	12/45-12/56	Median data for some parameters	IPS Sydney
	1950-1956	foF2 hourly data available	IPS Sydney
	01/57 – present	Digital data for all scaled parameters	IPS Sydney