Copyright WDC C1 for STP at RAL.
A description of the basic data follows.
Name Dim Type Width Dec NullValues Units ------------ ------ ---- ------ --- ---------- ------ Date 3 S 4 - -1 - Rotno 1 S 4 - 0 - CDay 1 B 2 - 0 - Kp 8 B 2 - 0 - SumKp 1 S 3 - 0 - Ap 8 S 3 - 0 - MeanAp 1 S 3 - 0 - Cp 1 R 3 1 0.00000 - C9 1 B 1 - 0 - SSN 1 S 3 - 0 - 10cmFlux 1 R 5 1 0.00000 - Code 1 B 1 - 0 -
Field Name Field Type Description of Field ------------ ---------- --------------------------------------- Year byte Number of Year (2 digits) Month byte Number of Month of Year Day byte Number of Day of Month Rotno small int Bartels solar rotation number (not Carrington) CDay byte Bartels day number within solar rotation Kp 8 * byte Kp values for eight 3-hour intervals of UT SumKp small int Sum of Kp values for the day Ap 8 * byte Ap values for eight 3-hour intervals of UT MeanAp small int Mean value of Ap for the day Cp real Value of Cp for the day C9 byte Value of C9 for the day SSN small int Sunspot Number Ri (Rz before 1981 January 1) 10cmFlux real Solar 10.7cm flux SA (S before 1964 January 1) Code byte Code for solar flux measurement - see notes
The Kp number has been multiplied by 10 and 3 added or subtracted according to the sign of the suffix. For example, 2+ becomes 23.
C CHARACTER 1 byte P DOUBLE PRECISION REAL 8 bytes R REAL 4 bytes I INTEGER 4 bytes S SMALL INTEGER 2 bytes B BYTE (unsigned integer 0-255) 1 byte