FILES AM19YY.DAT Three hourly indices aa for the year 19YY (provisional for files AMYYP.DAT) as one record per day to be read using format 30I4 containing : WORD 1 TO 4 : DATE AS MONTH - DAY - YEAR - DAY NUMBER IN THE YEAR WORD 5 : RECORD NUMBER IN THE FILE WORD 6 : MEAN DAILY VALUE AA OF aa WORD 7 TO 14 : 8 values of aa for the 8 three hour U.T. intervals (0-3,3-6,6-9,9-12,12-15,15-18,18-21,21-24) WORD 15 TO 30 : 16 times -1