000			02733nam a2200349Ia 4500
003			OSt
005			20260115120135.0
008			220909b |||||||| |||| 00| 0 eng d
020			_a9781441902382
037			_cTextbook
040			_aCSL _beng _cCSL
041			_aeng
084			_aB93 P9 TC _qCSL
100			_aThompson, M. J. _9875800
245		0	_aOrigin and dynamics of solar magnetism
260			_aBerlin, _bSpringer: _c2009.
300			_a428p. _b: col. ill.
490			_aSpace sciences series of ISSI
500			_aIncludes bibliographical references.
520			_aStarting 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. Specically, 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).
650			_aAstrophysics _9875801
650			_aExtraterrestrial physics _9875802
650			_aPlanetology physics _9875803
650			_aSpace sciences _9875804
650			_aPhysics _9875805
700			_aBalogh, A _9875806
700			_aCulhane, J L _9875807
700			_aNordlund, A _9875808
700			_aSolanki, S K _9875809
942			_hB93 P9 TC _cTB _2CC _n0
999			_c18175 _d18175