A comprehensive model of the quiet‐time, near‐Earth magnetic field: phase 3

By T. Sabaka, Nils Olsen, R. Langel. 2002

196 citations recorded by the source corpus.

SUMMARY The near-Earth magnetic field is caused by sources in the Earth’s core, ionosphere, magnetosphere, lithosphere and from coupling currents between the ionosphere and the magnetosphere, and between hemispheres. Traditionally, the main field (low degree internal field) and magnetospheric field have been modelled simultaneously, with fields from other sources being modelled separately. Such a scheme, however, can introduce spurious features, especially when the spatial and temporal scales of the fields overlap. A new model, designated CM3 (Comprehensive Model: phase 3), is the third in a series of efforts to coestimate fields from all of these sources. This model has been derived from quiet-time Magsat and POGO satellite and observatory hourly means measurements for the period 1960‐1985. It represents a significant advance in the treatment of the aforementioned field sources over previous attempts, and includes an accounting for main field influences on the magnetosphere, main field and solar activity influences on the ionosphere, seasonal influences on the coupling currents, a priori characterization of the influence of the ionosphere and the magnetosphere on Earth-induced fields, and an explicit parametrization and estimation of the lithospheric field. The result is a model that describes well the 591 432 data with 16 594 parameters, implying a data-to-parameter ratio of 36, which is larger than several popular field models.

Subfields: Astronomy and Astrophysics, Geophysics, Molecular Biology

View Paper: https://www.semanticscholar.org/paper/312543dbeae5f6947ead9768374cb98e4283f03e

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Citations in the corpus

The US/UK World Magnetic Model for 2015-2020 (2015, background): “For further details, see Sabaka et al. (2002), Lesur et al. (2004) and forthcoming publications.”
Extending comprehensive models of the Earth's magnetic field with Ørsted and CHAMP data (2004, methodology): “At the nth step, the Gauss method (Sorenson 1980) is used to update the current parameter estimate xn as xn+1 = xn + ( ATn WnAn + K∑ i=1 λi i )−1 ( ATn Wn (d − a(xn)) − K∑ i=1 λi i xn ) , (13) where Wn and An are the Huber weight matrix and the Jacobian of a(x) at xn, respectively.”
Crustal magnetic field of Mars (2004, methodology): “[49] We present in Figure 5 a comparison of the energy spectra of the Earth’s and Mars’ magnetic fields, using CM3 model [Sabaka et al., 2002] for the Earth, and FSU-90 [Cain et al., 2003] and our converted model for Mars.”