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Books > Science & Mathematics > Astronomy, space & time > Solar system
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The Origin and Dynamics of Solar Magnetism (Hardcover, 2009 ed.)
Loot Price: R2,945
Discovery Miles 29 450
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The Origin and Dynamics of Solar Magnetism (Hardcover, 2009 ed.)
Series: Space Sciences Series of ISSI, 32
Expected to ship within 10 - 15 working days
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Starting in 1995 numerical modeling of the Earth's dynamo has
ourished with remarkable success. Direct numerical simulation of
convection-driven MHD- ow in a rotating spherical shell show
magnetic elds that resemble the geomagnetic eld in many respects:
they are dominated by the axial dipole of approximately the right
strength, they show spatial power spectra similar to that of Earth,
and the magnetic eld morphology and the temporal var- tion of the
eld resembles that of the geomagnetic eld (Christensen and Wicht
2007). Some models show stochastic dipole reversals whose details
agree with what has been inferred from paleomagnetic data
(Glatzmaier and Roberts 1995; Kutzner and Christensen 2002; Wicht
2005). While these models represent direct numerical simulations of
the fundamental MHD equations without parameterized induction
effects, they do not match actual pla- tary conditions in a number
of respects. Speci cally, they rotate too slowly, are much less
turbulent, and use a viscosity and thermal diffusivity that is far
too large in comparison to magnetic diffusivity. Because of these
discrepancies, the success of geodynamo models may seem surprising.
In order to better understand the extent to which the models are
applicable to planetary dynamos, scaling laws that relate basic
properties of the dynamo to the fundamental control parameters play
an important role. In recent years rst attempts have been made to
derive such scaling laws from a set of numerical simulations that
span the accessible parameter space (Christensen and Tilgner 2004;
Christensen and Aubert 2006).
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