Open AccessA definitive model of the geomagnetic field and its secular variation for 1965 — II. Dip‐poles from surface to core
Author(s) -
Barraclough D. R.,
Malin S. R. C.
Publication year - 1981
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1981.tb02722.x
Subject(s) - earth's magnetic field , geology , secular variation , geomagnetic secular variation , magnetic dip , core (optical fiber) , geophysics , surface (topology) , geodesy , geomagnetic pole , inner core , figure of the earth , field (mathematics) , geometry , physics , magnetic field , optics , mathematics , quantum mechanics , geomagnetic storm , pure mathematics
Summary Study of the morphology of the geomagnetic field at the surface of the Earth's core shows that there are 14 dip‐poles. Their positions and senses are given and they are classified into principal, focal and nodal poles. By investigating the morphology of the field at intermediate depths between the surface of the core and the Earth's surface, the evolution of the poles is traced as their number decreases to the familiar pair of dip‐poles at the surface of the Earth. In the process, six cuspidal poles are located and two neutral points are discovered.