UMAGF Codes

Example:

Definition of symbols:

First Line-

  • UMAGF comes from MAGnetic activity, code F

  • I I I I I = 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 = ty../../pical 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.