The Yohkoh week starts on Sunday and ends on Saturday. CAUTION: Yohkoh data taken at 00:01 (one minute after midnight) on Sunday morning is most likely in a file and tape for the previous week since the orbit started on Saturday and the first full orbit for Sunday has not started. Up to the first 90 minutes of data taken on Sunday could be stored in the previous week, depending on when the spacecraft day begins.
The weekly IDs are of the form:
YY_WWa.NN
where YY - Year of data
WW - Week number of the data (1 to 53)
a - is fixed (reserved for future use)
NN - is the program version number which created the file
The following are the dates covered by each of the weeks for 1991-1995:
