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 0945/182 in 1986. Prior to that date all data on 150 EMT	03/37-11/51	Nitrate file	IPS station Canberra	1937-12/1970 period of 1944 to 7/48 not shown on archive listing	Published in data books	NSW Archives
	01/12/51-30/07/77	35mm film	NSW Archives	01/71-12/79	Computer printout	No copies kept
	31/01/75-02/06/96 not continuous prior 08/77	16mm film	IPS Sydney	1/80 – 12/2000	Microfiche	IPS Sydney	Spares not available for all years
	09/06/94-22/06/97	4d raw and clean digital data	IPS Sydney
	01/01/91-11/11/96	5a clean digital data	IPS Sydney
	31/03/99-present	5d raw and clean digital data	IPS Sydney				No data for 00-02, 04.
	04/07/97-present	Cadi raw and clean digital data	IPS Sydney
	04/01/50-	Digital data for all scaled parameters.	IPS Sydney				Up to one year ago.
	Keyed in data
	1937-1963	Median data for some parameters	IPS Sydney
	1950-1963	foF2 hourly data available	IPS Sydney
	1964 to present	Digital data for all scaled parameters	IPS Sydney