Aims. We suggest an explanation for the high-frequency power excess surrounding active regions known as seismic halos. Methods. We use numerical simulations of magneto-acoustic wave propagation in magnetostatic sunspot model. Results. We propose that seismic halos can be caused by the additional energy injected by high-frequency fast mode waves refracted in the higher atmosphere due to the rapi...

In this paper, we present a novel semi-classical theory of the electrostatic and magnetostatic fields explain nonlocality problem in context Aharonov-Bohm effect [1]. Specifically, show that possess quantum nature manifests if certain conditions are met. particular, wave amplitudes seen to exist even regions where classical vanish they operate on electron functions locally as unitary phases. Th...

Efficient implementations of non-uniform grid method (NGM) for fast computation of magnetostatic field on general purpose Graphics Processing Units (GPUs) are introduced. The NGM reduces the computational complexity of the magnetostatic field evaluation from 2 ( ) O N to ( ) O N . It is shown that the massive parallelization of GPUs leads to significant speed-up of the NGM field evaluation. Wit...

Magnetostatic backward volume spin-wave SW pulses have been cloned and trapped through the use of multiple, properly timed, parametric pumping PP pulses. The experiment was done with 30-ns-wide pulses at 5 GHz in a 7.1m-thick yttrium iron garnet film. Well-timed, large-area, high-power, 2-ns-wide microwave pulses at 10 GHz were used to pump the SW pulses. The interaction between the initial SW ...

Electromagnetically induced transparency ~EIT!, a phenomenon well known in atomic systems, has a natural analogy in a classical magnetized plasma. The magnetized plasma has a resonance for right-hand polarized electromagnetic waves at the electron cyclotron frequency V0 , so that a probe wave with frequency v15V0 cannot propagate through the plasma. The plasma can be made transparent to such a ...

We present a refinement of the widely accepted spin-wave spectrum that Kalinikos and Slavin computed for magnetic films with an in-plane magnetization (1986). The spin wave follows from diagonal approximation in this theory becomes inaccurate relatively thick films, as has already been noted by Kreisel et al. (2009). Rather than solving integrodifferential equation which magnetostatic Green's f...

A magnetic energy functional is derived for an arbitrary curved thin shell on the assumption that the magnetostatic effects can be reduced to an effective easy-surface anisotropy; it can be used for solving both static and dynamic problems. General static solutions are obtained in the limit of a strong anisotropy of both signs (easy-surface and easy-normal cases). It is shown that the effect of...

In this paper, the reflection and refraction of longitudinal wave from a plane surface separating a micropolar viscoelastic solid half space and a fluid saturated incompressible half space is studied. A longitudinal wave (P-wave) impinges obliquely at the interface. Amplitude ratios for various reflected and transmitted waves have been obtained. Then these amplitude ratios have been computed nu...