| 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 | 00h 20m | 21d 20h | sudden | +18 | 148 | 10.7 | 61 | 147 | 29 |
| Memambetsu | 00h 20m | 21d 20m | sudden | +16 | 146 | 12.9 | 39 | 20 | 67 |
| Kanoya | 00h 20m | 21d 20h | sudden | +24 | 168 | 9.9 | 64 | 39 | 11 |
(*) 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 2018.
Plot of Memambetsu 1-minute geomagnetic field for the geomagnetic storm on 20 April 2018.
Plot of Kanoya 1-minute geomagnetic field for during the geomagnetic storm on 20 April 2018.
*) Plot diagram opens in a separate window.
Copyright (c) 2024 Kakioka Magnetic Observatory, Japan Meteorological Agency. All rights reserved.
