Abstract
SUMMARY We have used the model CALS7K.2 to explore the possible influence of the time-varying non-dipole components of the geomagnetic field during field reversals and excursions. Our findings suggest that non-dipole components could add significant structure to the field during the reversal and excursion processes. Globally, the main polarity reversal is variable in duration and rapid reversals on subdecadal timescales are seen for a small number of locations. The model generates variable reversal paths; however, there is a longitudinal preference both spatially and, more weakly, temporally. Directional reversal features are not globally synchronous: some polarity changes finish before they start elsewhere. Global intensity variations, however, appear more coherent. We also find support for the idea that field intensity changes occur some time before and after the major directional changes of the reversal. Large excursions appear naturally when the axial dipole has been reduced to 20 per cent for the whole time period; however, they are not globally synchronous or uniform.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
