Computer Science – Sound
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..265c&link_type=abstract
Geophysical Research Letters, vol. 9, Apr. 1982, p. 265-268.
Computer Science
Sound
30
Earth Core, Geomagnetism, Spherical Harmonics, Fourier Analysis, Magnetic Flux, Power Spectra, Satellite Sounding, Wavelengths
Scientific paper
Although there are computational advantages to the representation of the earth's magnetic field by spherical harmonic coefficients of the magnetic potential, up to the thirteenth degree and order, the following disadvantages emerge: (1) the use of spherical harmonics of up to a certain degree does not remove wavelengths greater than a certain value from the surface fields, and (2) the total field magnitudes represented by spherical harmonics up to a certain degree have minimum wavelengths equal to the circumference of the earth divided by twice the maximum degree of the harmonic used. The implications of the ways in which surface fields are separated into core and crustal components are discussed, and it is concluded that since field signals are generated in the core, the representation of the core field by spherical harmonics of potential does not adequately represent all core field components.
Carle H. M.
Harrison Christopher G. A.
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