From: Geomagnetic secular variation forecast using the NASA GEMS ensemble Kalman filter: A candidate SV model for IGRF-13
\(t_a\)
\(t_{f_1}\)
\(t_{f_2}\)
\(t_{f_3}\)
\(t_{f_4}\)
\(t_{f_5}\)
\(t_{f_6}\)
Exp.A
2017
2018
2019
2020
2021
2022
2023
Exp.B
2024
Exp.C
2025