Modelling Secular Variation in the Southwest Pacific
Maha Ali Alfheid *
Alasala Colleges/Colleges of Engineering, P.O.Box 2666, Dammam, 31483, Saudi Arabia.
Mohana Faroug Attia
Alasala Colleges/Colleges of Engineering, P.O.Box 2666, Dammam, 31483, Saudi Arabia.
*Author to whom correspondence should be addressed.
Abstract
A spherical cap harmonic analysis (SCHA) model has been used to derive a high resolution regional model of the geomagnetic field in the southwest Pacific region over the past 400 years. Two different methods, a self-consistent and the gufm1 dipole method, have been used to fill in gaps in the available data. The data used in the analysis were largely measurements of the magnetic field recorded in ships logs on voyages of exploration in the region. The method chosen for the investigation used a spherical cap of radius
Keywords: Southwest pacific, geomagnetic field, gufm1, spherical harmonic analysis.