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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