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The CHAOS-3 geomagnetic field model and candidates for the 11th generation IGRF
- Source :
- Earth, Planets and Space. 62(10):719-727
- Publisher :
- Springer Nature
-
Abstract
- As a part of the 11th generation IGRF defined by IAGA, we propose a candidate model for the DGRF 2005, a candidate model for IGRF 2010 and a candidate model for the mean secular variation between 2010 and 2015. These candidate models, the derivation of which is described in the following, are based on the latest model in the CHAOS model series, called “CHAOS-3”. This model is derived from more than 10 years of satellite and ground observatory data. Maximum spherical harmonic degree of the static field is n = 60. The core field time changes are expressed by spherical harmonic expansion coefficients up to n = 20, described by order 6 splines (with 6-month knot spacing) spanning the time interval 1997.0–2010.0. The third time derivative of the squared magnetic field intensity is regularized at the core-mantle boundary. No spatial regularization is applied.
- Subjects :
- 010504 meteorology & atmospheric sciences
Mathematical analysis
Spherical harmonics
Geology
Chaos model
010502 geochemistry & geophysics
Geodesy
01 natural sciences
Secular variation
Magnetic field
Earth's magnetic field
Observatory
Space and Planetary Science
Regularization (physics)
Time derivative
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 13438832
- Volume :
- 62
- Issue :
- 10
- Database :
- OpenAIRE
- Journal :
- Earth, Planets and Space
- Accession number :
- edsair.doi.dedup.....9fb8f129640a39c17f2908b39701d81d
- Full Text :
- https://doi.org/10.5047/eps.2010.07.003