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 2330/189 in 1986. Prior to that date all data on 150 EMT	10/12/82-6/10/95	16mm film	IPS Sydney	1982-1998	Microfiche	IPS Sydney	Spares not available for all years
	24/08/94-26/11/02	4d raw and clean digital	IPS Sydney				clean data from 04/08/96 to 26/11/02.
	16/05/95-31/10/98	5c clean digital	IPS Sydney				Clean data only.
	04/06/99-07/06/99	Cadi raw digital	ISP Sydney				Only 4 days and only raw data.
	30/06/99-present	5d raw and clean digital	IPS Sydney				active ionosonde.
	10/12/82-	Digital data for all scaled parameters.	IPS Sydney				Scaled data available until about one year ago.
	Keyed in data
	12/82-1984	Digital data for all scaled parameters	IPS Sydney