Open Access
Table 1
Physical drivers along with a brief description.
| Feature name | Description |
|---|---|
| IE, IU | Auroral electrojet indices |
| HF-INTEU | High-frequency interferometry index, identifying activity over the European network of ionosondes (see Sect. 2.2) |
| SZA | Solar zenith angle, namely the angle between the local zenith and the line of sight from that point to the Sun |
| F10.7 | Solar radio flux at 10.7 cm (2800 MHz) |
| ρ, vx, Bz | Solar wind and interplanetary magnetic field, measured by ACE and/or DSCOVR spacecrafts at the Lagrange point L1 and projected to the bow shock nose |
| SMR | Partial ring current index |
| Newell | Coupling function that quantifies the energy transfer from the magnetosphere to the ionosphere |
| Hp30 | Half-hourly geomagnetic index |
| SEC (Athens, Juliusruh, Průhonice, Rome, San Vito) | Spectral energy contribution (%) of the perturbation (one feature per ionosonde) |
| Azimuth (Athens, Juliusruh, Průhonice, Rome, San Vito) | Azimuth (degrees from true North) of the perturbation (one feature per ionosonde) |
| Velocity (Athens, Juliusruh, Průhonice, Rome, San Vito) | Velocity of the perturbation (one feature per ionosonde) |
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