More information can be found in the data availability charts . See also the rules of the road and the description of the data quality . Selection of events For practical reasons, we have limited the maximum length of a single event to be 48 hours. We can also provide CD-ROM's for a nominal price.
Station sets Five different sets of stations are available.
The time definition is as given in the IAGA format description. Unit 1 nT. 3. World Data Center format. One-minute averages only. Unit 1 nT. 4.