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 1015/182 in 1986. Prior to that date all data on 150 EMT	08/06/43-21/12/52	Nitrate file	IPS station either Camden or Canberra	06/43-12/70	Published in data books	NSW Archives
	01/01/53-24/02/78	35mm film	NSW Archives	1/71-12/80	Computer printout	No copies kept
	01/79-12/86	16mm film	IPS Sydney	1/80 – 12/86	Microfiche	IPS Sydney	Spares not available for all years
	10/06/97-29/04/98	5c clean digital	IPS Sydney				Clean data only.
	29/05/98-present	5d raw and clean digital	IPS Sydney				Active ionosonde.
	02/01/50-	Digital data for all scaled parameters.	IPS Sydney				Up to one year ago. no data for 87-97. Median data from 06/43.
	Keyed in data
	06/43-12/56	Median data for some parameters	IPS Sydney
	1950-1956	foF2 hourly data available	IPS Sydney
	01/57-12/86	Digital data for all scaled parameters	IPS Sydney