By Y. Kamide
Long ago 20 years a succession of direct observations by way of satellites, and of intensive machine simulations, has resulted in the belief that the polar ionosphere performs a critical function in large-scale magnetospheric tactics - a manifestation of the physics linkage desirous about solar-terrestrial interactions. Spatial/temporal adaptations in high-latitude electromagnetic phenomena, comparable to dynamic aurorae, electrical fields and currents, have proved to be tremendous advanced. Now the problem is to realize the immense volume of advanced measurements made during this magnetosphere-ionosphere sysstem of the Earth. This booklet addresses coupling among the recent, yet dilute, magnetospheric plasma and the chilly, yet dense, plasma within the ionosphere.
In 5 significant chapters, this e-book provides: - easy homes of magnetosphere-ionosphere coupling; - morphology of electrical fields and currents at excessive latitudes; - worldwide modeling of magnetosphere-ionosphere coupling; - modeling of ionospheric electrodynamics; - present matters, corresponding to auroral particle acceleration, substorms, penetration of high-latitude fields into low latitudes.
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Additional info for Magnetosphere-Ionosphere Coupling
28) Combine these modes to form a narrow wavepacket Ψ = on k0 . 28) keep only terms with κ centered around 0. The frequency in the exponent is expanded: ωk0 +κ = ωk0 + κ · vg + 12 (κ · ∇k0 )2 ωk0 , where vg is the group velocity ∇k0 ωko . 28). 28). 28) were absent, the φ(κ) would be constants. 30) 2 q |φ| φ where, on the right hand side, only terms near the center of the packet have been retained. 31) For suﬃciently simple geometries and/or dispersion relations, the “diﬀusion” term on the left hand side is diagonal, becoming proportional to ∇2x φ.
In our present problem, this means that, even if the inﬁnite lattice is totally lossfree, the equation of motion for M in the inﬁnite medium must include a loss torque. However, as we shall see, in the loss-free medium, that loss torque is irremedially non-local even when the lattice has ﬁnite viscosity; a moment expansion would be possible, were it not for non-locality introduced by the decomposition of ∇ · σ ˜ . 15) Here we require the retarded of the two possible solutions for gtr . ) For a simple derivation, see Jackson (1999).
In some situations, such as in ferromagnetic resonance at low signal levels, the magnetization vector precesses around a preferred direction with only a small angle of opening. The part m of M , transverse to the preferred direction, is then small, and the equations of motion may be linearized. In most applications, such as magnetic recording, the motion of the magnetization vector is large and the linearized theory is not immediately relevant. However, it frequently oﬀers valuable insight into what to expect in more realistic situations.
Magnetosphere-Ionosphere Coupling by Y. Kamide