UMAGF Code
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Code book- UMAGF

UMAGF

Geomagnetic Ak index (allows for 3-digit value)
Geomagnetic K-indices for the period reported
Geomagnetic disturbances with time of occurrence
Time and value of minimum H-component (optional)

Example:

Definition of symbols:

First Line-

 

    UMAGF comes from MAGnetic activity, code F

 

    = station indicator

 

    Y = last digit of year

    MM = month of year, 01 = January, 02 = February, etc.

    DD = UT day of month

 

    HHmm = UT time in hour and minute

    / = filler

Second Line-

 

    DD = UT day of beginning 24-hour period reported

    HH = UT hour of beginning 24-hour period reported

    a = last digit of check sum of the Ak (bbb) and the 8 Ks.

 

    1 = indicator for Ak index

    bbb = Ak index for UT date If Ak is not available, use ///

 

    2 = indicator Ak index

    kkkk = first 4 K index

 

    3 = indicator for last 4 K indices

    kkkk = last 4 K index

 

    c = indicator telling the time reported in HHmm is

        1 = storm end
        2 = bay (psc)
        3 = typical crochet
        4 = provisional figures
        6 = gradual storm beginning
        7 = sudden storm beginning
        8 = very marked sudden storm beginning
        9 = sudden impulse

    HHmm = UT hour and minute of phenomenon indicated by c.
    If c=4, HHmm is used for reporting up to four additional K indices (3-hour periods) following the 24-hour interval reported by the 2 and 3 groups.

 

    d

        5 = signifies the following time refers to absolute value of minimum reached on the horizontal component

    HHmm = UT hour and minute of minimum

Note: Omit dHHMM group if data not available

 

    e e e e e = intensity of minimum expressed in nT

Note: Omit group e e e e e if these measurements are not made.

Note: / is to be used for data not available.