Publication Date:
2011-03-17
Description:
SUMMARY We analyse the residuals between a continuous geomagnetic field model of the internal field, C 3 FM, and observed secular variation. A large part of the residual variations correlate closely with the D ST -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 D ST -index. Notable cross-correlation is also seen between the residuals and D ST -index with a lag of about 55 months.
Print ISSN:
0956-540X
Electronic ISSN:
1365-246X
Topics:
Geosciences
Published by
Oxford University Press
on behalf of
The Deutsche Geophysikalische Gesellschaft (DGG) and the Royal Astronomical Society (RAS).
