Signal from noise in geomagnetic field modelling: denoising data for secular variation studies

Details Signal from noise in geomagnetic field modelling: denoising data for secular variation studies Signal from noise in geomagnetic field modelling: denoising data for secular variation studies

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011geoji.185..653w&link_type=abstract

Geophysical Journal International, Volume 185, Issue 2, pp. 653-662.

Physics

2

Time-Series Analysis, Magnetic Anomalies, Modelling And Interpretation, Rapid Time Variations

Scientific paper

We analyse the residuals between a continuous geomagnetic field model of the internal field, C3FM, and observed secular variation. A large part of the residual variations correlate closely with the DST-index, suggesting an origin from unmodelled external field variations. Removal of this signal enhances the resolution of fine-scale detail in secular variation; this is useful in considering the phenomenology of geomagnetic jerks. The residual variations between different observatories show even better correlation, suggesting the possibility of the construction of a proxy for the DST-index. Notable cross-correlation is also seen between the residuals and DST-index with a lag of about 55 months.

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