From: PCA and vTEC climatology at midnight over mid-latitude regions
Region
vTECGNSS (TECu)
vTECIRI (TECu)
East
West
North America
19.7
15.6
14.9
10.0
South America
15.7
20.8
12.8
20.9
Asia
19.3
18
13.2
11.9
Oceania
20.0
13.7
7.6