Physics
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9211597b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Oct. 10, 1987, p. 11597-11608.
Physics
18
Computerized Simulation, Geodynamics, Geomagnetism, Magnetic Variations, Secular Variations, Stochastic Processes, Eigenvalues, Legendre Functions, Mathematical Models, Spherical Harmonics
Scientific paper
The method of stochastic inversion is extended to the simultaneous inversion of both main field and secular variation. In the present method, the time dependency is represented by an expansion in Legendre polynomials, resulting in a simple diagonal form for the a priori covariance matrix. The efficient preconditioned Broyden-Fletcher-Goldfarb-Shanno algorithm is used to solve the large system of equations resulting from expansion of the field spatially to spherical harmonic degree 14 and temporally to degree 8. Application of the method to observatory data spanning the 1900-1980 period results in a data fit of better than 30 nT, while providing temporally and spatially smoothly varying models of the magnetic field at the core-mantle boundary.
No associations
LandOfFree
Simultaneous stochastic inversion for geomagnetic main field and secular variation. I - A large-scale inverse problem does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Simultaneous stochastic inversion for geomagnetic main field and secular variation. I - A large-scale inverse problem, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Simultaneous stochastic inversion for geomagnetic main field and secular variation. I - A large-scale inverse problem will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1775894