| 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 | 02h 30m | 20d 22h | sudden | +12 | 150 | 3.8 | 60 | 139 | 24 |
| Memambetsu | 02h 30m | 20d 22m | sudden | +14 | 149 | 5.6 | 29 | 16 | 36 |
| Kanoya | 02h 30m | 20d 22h | sudden | +15 | 173 | 4.4 | 54 | 31 | 10 |
(*) 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 20 April 2020.
Plot of Memambetsu 1-minute geomagnetic field for the geomagnetic storm on 20 April 2020.
Plot of Kanoya 1-minute geomagnetic field for during the geomagnetic storm on 20 April 2020.
*) Plot diagram opens in a separate window.
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