Table 1 RRMSE at four stations based on the two methods.

From: Predicting low ionospheric parameters and low frequency sky wave propagation strength using machine learning

Station name

Kriging method (%)

SCSI method (%)

Kokubunji

7.00

1.98

Okinawa

11.85

4.10

Wakkanai

10.82

9.60

Yamagawa

9.41

5.07