Core magnetic field and associated surface flow variations from 1999 to 2025

A recent update of the MCM series of magnetic field models and associated core surface flows is presented. The models were derived sequentially from year 1999 to 2025, using magnetic satellite and ground observatory data. A linear Kalman filter approach and prior statistics based on numerical dynamo runs were used. The core field, the secular variation and the core surface flow models present the same characteristics as previous versions up to 2023 and we investigate how this behaviour evolves over the most recent years. In particular, before 2023 filtering out the flow variation periods longer than ∼11.5 years revealed filtered azimuthal flow with ∼7 years periodicities and patterns propagating westward by ∼60deg longitude per year. Preliminary results show that the same patterns are maintain over the most recent epochs.