Fig. 3
From: Ground-based VLF wave intensity variations investigated by the principal component analysis
Seasonal variations of the average (a) PC1, (b) PC2, (c) PC3 coefficients, and (d) Kp index
Fig. 3 | Earth, Planets and Space
From: Ground-based VLF wave intensity variations investigated by the principal component analysis
Seasonal variations of the average (a) PC1, (b) PC2, (c) PC3 coefficients, and (d) Kp index