The localization of intracerebral dipole sources for detecting pathological events is one object of magnetoencephalography (MEG). To facilitate interactive evaluation of MEG data arti-cial neural network models are used. Trained on simulated examples with superimposed noise they are able to predict the so-called \goodness of t" of real data in contrast to minimization algorithms, which are iter...

A crucial remaining challenge in the development of the magnetic resonance force microscope (MRFM) is to place the magnetic probe on the mechanical resonator. Here we address the problem of spurious detector response arising from interactions between the magnetic tip and various external applied elds. Ferromagnetic resonance experiments on a microscopic, thin-lm yttrium iron garnet crystal moun...

Geotail energetic particle, magnetic ®eld data and plasma observations (EPIC, MGF and CPI experiments) have been examined for a number of energetic particle bursts in the distant tail …120Re < jXGSMj < 130 Re†, associated with moving magnetic ®eld structures, following substorm onsets. The features obtained from this data analysis are consistent with the distant magnetotail dynamics determined ...

3 S u m m a r y : We present simulations of the 3D nonlinear induction equation in order to investigate the temporal evolution of large-scale magnetic elds in spiral galaxies. Our model includes diierential rotation, ambipolar diiusion and, based on small-scale turbulence, eddy diiusivity and the tensorial-eeect with magnetic feedback. The nonax-isymmetric spiral pattern and { if considered { t...

In astrophysical situations, e.g. in the interstellar medium (ISM), neutrals can provide viscous damping on scales much larger than the magnetic diffusion scale. Through numerical simulations, we have found that the magnetic field can have a rich structure below the dissipation cutoff scale. This implies that magnetic fields in the ISM can have structures on scales much smaller than parsec scal...

A comparison of BBSO H centerline ltergrams and videomagnetograms was made to investigate the existence of non-potential magnetic elds in the quiet Sun near magnetic network. We use the bril structure in the H images as a proxy for the horizontal chromospheric magnetic eld which we compare with the horizontal eld obtained by potential extrapolation of the observed, line-of-sight photospheric el...

We demonstrate that the combination of Zeeman, polarimetry, and ion-to-neutral molecular line width ratio measurements permits the determination of the magnitude and orientation of the magnetic field in the weakly ionized parts of molecular clouds. Zeeman measurements provide the strength of the magnetic field along the line of sight, polarimetry measurements give the field orientation in the p...

We study dynamical symmetry breaking in three-dimensional QED with Chern-Simons term, considering the screening eeect of N avor fermions. We nd a new phase of vacuum, on which both fermion mass and magnetic eld are dynamically generated, when the coeecient of Chern-Simons term equals N e 2 =4. The resultant vacuum becomes the nite density state half lled by fermions. For = Ne 2 =2, we nd the fe...

It is analysed the discrepancy about the coronal magnetic eld between solar optic and solar radio using magnetic bril concept with lling factor and fractal structure model. The magnetic eld of 100 G considered in solar optics is mean value in a large scale, and that of 1000 G in solar should be the value of ne structures inside \macro" loop. The magnetic eld in the solar corona is poorly known ...

We present results of imaging polarimetry of the H 2 v=1-0 S(1) line towards the outtow lobes of DR21. The polarisation vectors are produced by dichroic absorption in a medium of aligned grains and therefore delineate the direction of the magnetic eld, projected onto the plane of the sky, aligning those grains. It is argued that the polarisation is dominated by grains within the DR21 cloud. The...