# Data Dictionary - Planetary Geomagnetic Kp Index - 3-hourly, 90+ years, cleaned Parquet

**Units:** all `kp_index` values are in **Kp**.  Times are UTC.

| column | type | description |
|---|---|---|
| `zone` | str | EARTH (planetary index) |
| `ts` | timestamp (UTC) | 3-hour interval |
| `kp_index` | float | Planetary Kp index, 0-9 |
| `unit` | str | Unit |
| `res_min` | int | Native resolution (180) |

*Source: NOAA Space Weather Prediction Center (SWPC) / NCEI.*