Geomagnetic Activity Classifications at UK Observatories
The following table shows the classifications of geomagnetic activity based on the DRX values at the three UK observatories.
| Observatory | Activity Classification | Range of DRX |
|---|---|---|
| Lerwick | Quiet | 0 <= DRX < 10 |
| Quiet-Unsettled | 10 <= DRX < 15 | |
| Unsettled | 15 <= DRX < 24 | |
| Unsettled-Disturbed | 24 <= DRX < 45 | |
| Disturbed | 45 <= DRX < 85 | |
| Very Disturbed | 85 <= DRX | |
| Eskdalemuir | Quiet | 0 <= DRX < 11 |
| Quiet-Unsettled | 11 <= DRX < 16 | |
| Unsettled | 16 <= DRX < 24 | |
| Unsettled-Disturbed | 24 <= DRX < 35 | |
| Disturbed | 35 <= DRX < 60 | |
| Very Disturbed | 60 <= DRX | |
| Hartland | Quiet | 0 <= DRX < 8 |
| Quiet-Unsettled | 8 <= DRX < 12 | |
| Unsettled | 12 <= DRX < 18 | |
| Unsettled-Disturbed | 18 <= DRX < 25 | |
| Disturbed | 25 <= DRX < 40 | |
| Very Disturbed | 40 <= DRX |
Models & Compass Variation
Space Weather
INTERMAGNET software
