| 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 19m | 25d 00h | sudden | +12 | 107 | 10.1 | 66 | 189 | 32 |
| Memambetsu | 15h 19m | 25d 00m | sudden | +15 | 131 | 16.2 | 34 | 22 | 71 |
| Kanoya | 15h 19m | 25d 00h | sudden | +13 | 114 | 8.9 | 69 | 41 | 15 |
(*) 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 21 April 2017.
Plot of Memambetsu 1-minute geomagnetic field for the geomagnetic storm on 21 April 2017.
Plot of Kanoya 1-minute geomagnetic field for during the geomagnetic storm on 21 April 2017.
*) Plot diagram opens in a separate window.
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