| Observatory | Commencing time | Ending time | Geomagnetic field | Geoelectric field | |||||
| Type (sudden/gradual) | Amplitude of abrupt onset H (nT) g(nT) |
Range | Range | ||||||
| Hour Minute (UTC) |
Date Time (UTC) |
Horizontal component H (nT) |
Declination D (arcminute) |
Vertical component Z (nT) |
East-west component (mV/km) |
North-south component (mV/km) |
|||
| Kakioka | 15h 50m | 13d 21h | sudden | +16 | 121 | 6 | 41 | 148 | 25 |
| Memambetsu | 15h 50m | 13d 21m | sudden | +21 | 138 | 9.7 | 20 | 11 | 32 |
| Kanoya | 15h 50m | 13d 21h | sudden | +17 | 128 | 5.3 | 47 | ||
(*) Time is in UTC (Universal Time Coordinated).
(*) Time is given in 1-minute increments for the sudden commencement type and in 0.1-hour increments for the gradual commencement type.
(*) "-1" is displayed for the range, when it is unknown due to missing measurements, etc.
(*) The range may not be determined for a storm which is followed by the next one before its ending (the ending time is indicated by "C").
Plot of Kakioka 1-minute geomagnetic field for the geomagnetic storm on 12 December 1999.
Plot of Memambetsu 1-minute geomagnetic field for the geomagnetic storm on 12 December 1999.
Plot of Kanoya 1-minute geomagnetic field for during the geomagnetic storm on 12 December 1999.
*) Plot diagram opens in a separate window.
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