Table 1
Ionospheric perturbations classes.
| Classes | Sub-classes | ||
|---|---|---|---|
| 1. Sporadic E (Es) | 1a. Large | 1b. Medium | 1c. Small |
| 2. Traveling ionospheric disturbances (TIDs) | 2a. Large | 2b. Medium | 2c. Small |
| 3. Ionosphere irregularities | 3a. Large | 3b. Medium | 3c. Small |
| 4. Smooth profiles | 4a. Large | 4b. Medium | 4c. Small |
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