Download e-book for iPad: advances in solar system magnetohydrodynamics by Eric R. Priest, Alan W. Hood

By Eric R. Priest, Alan W. Hood

ISBN-10: 0521403251

ISBN-13: 9780521403252

Lots of the sun method exists within the plasma kingdom (the fourth kingdom of matter). Its refined nonlinear interplay with the magnetic box should be defined by means of the equations of magnetohydrodynamics (MHD). over the last few years this crucial and complicated box of study has been actively pursued and more and more diversely utilized to the fields of geophysics, house physics, and astrophysics. it really is, for example, appropriate to the research of many dynamic phenomena reminiscent of sunlight flares, and the origins of magnetic fields within the solar and the Earth. This publication examines easy MHD issues, similar to equilibria, waves, instabilities, and reconnection, and examines each one within the context of other parts that make the most of MHD. some of the world's major specialists have contributed to this quantity, which has been edited by way of of the major lovers. it really is was hoping that it'll support researchers to understand and comprehend the typical threads one of the various branches of magnetohydrodynamics.

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T . . Dy (a) Er (b) 5 / bY_ 0 (2 o o ~ r=O -5 0 -10 - 0 1 -1 0 1 sfrain ¢ (10 -2) Fig. 30. Critical fields for Dy (a) and for Er (b) c-axis superlattices calculated as a function of the lattice mismatch e, based on a perfect epitaxy model. The experimental critical field values are shown by the triangles for comparison. The parameter r represents the ratio of non-magnetic to magnetic material. The model predicts that the growth of Er on a substrate with a smaller basal plane lattice parameter than Er would produce a ferromagnetic transition temperature higher than in the bulk.

38 (right), and by the large ferromagnetic intensity remaining on the (0002) peaks in fig. 38 (left). After the field was removed the spins remain metastably locked into the ferromagnetic configuration until the sample temperature was warmed above 100 K in zero field. In a thicker Y sample [Dyl6lY20]89 with lower anisotropy energy density, essentially all the ferromagnetic intensity was lost from the (0002) peak when H was reduced to 0 (see fig. 39 (left)). However, as illustrated in fig. 39 (right), the intrinsic helimagnetic state was only partially reformed, and in particular the remanent state Q peaks are significantly broadened suggestive of a partial loss of interlayer coherence following the magnetization.

All of these systems have the common feature that the superlattice growth axis is along the c* propagation direction of the spin system. MAGNETISM IN ARTIFICIALMETALLICSUPERLATTICES 27 In order to test the dependence of the ordering on the superlattice growth direction relative to the c* magnetic propagation vector, superlattices were prepared by Flynn et al. (1989) with the growth axis along a basal plane direction. This required new preparation procedures due to the unavailability of conventional substrate materials with an appropriate lattice matching to the a-c plane of the hexagonal rare earths.

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advances in solar system magnetohydrodynamics by Eric R. Priest, Alan W. Hood


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