We study scattering theory for systems of N particles in a constant magnetic eld under the assumption that the system has no neutral subsystems. We prove the Mourre estimate using the generator of dilations along the direction of the eld as the conjugate operator, and asymptotic completeness of wave operators for short-range interactions.

Context. The structure of astrospheres depends on the interaction between host star and surrounding interstellar medium (ISM). Observations offer new opportunities to learn about details this interaction. Aims. aim work is study global astrospheres, concentrating case strong magnetic field low relative velocity ISM. Methods. We used a simple magnetohydrodynamical numerical code simulate stellar...

Using observational data from the literature, we show that the non-thermal radio luminosity (L) of supernova remnants (SNRs) is a strong function of the average gas surface density (Σg) of the galaxy in which the remnants reside, from normal spirals to dense luminous starbursts. Our result supports the interpretation of the radio sources in M82 and Arp 220 as normal SNRs, and not “radio” supern...

The collapse and fragmentation of initially prolate and oblate, magnetic molecular clouds is calculated in three dimensions with a gravitational, radiative hydrodynamics code. The code includes magnetic field effects in an approximate manner: magnetic pressure, tension, braking, and ambipolar diffusion are all modelled. The parameters varied for both the initially prolate and oblate clouds are ...

ABSTRACT Linear polarization has been measured in several gamma-ray burst (GRB) afterglows. After a few days, arises from the forward shock emission that depends on post-shock magnetic field. The latter can originate both compression of existing fields, here interstellar medium (ISM) field, and shock-generated instabilities. For short GRBs, previous modelling arising considered random field ful...

Data from HF-radars are used to make the ®rst simultaneous conjugate measurements of the dayside reconnection electric ®eld. A period of 4 h around local magnetic noon are studied during a geospace environment modeling (GEM) boundary layer campaign. The interplanetary magnetic ®eld (IMF) was southward whilst the eastward component (By) was variable. The ̄ow patterns derived from the radar data ...

The Diluted-Field Ising Model, a random nonnegative eld fer-romagnetic model, is shown to have a unique Gibbs measure with probability 1 when the eld mean is positive. Our methods involve comparisons with ordinary uniform eld Ising models. They yield as a corollary a way of obtaining spontaneous magnetization through the application of a vanishing random magnetic eld. We also establish existenc...

We prove that the two dimensional free magnetic Schrr odinger operator, with a xed constant magnetic eld and Dirichlet boundary conditions on a planar domain with a given area, attains its smallest possible eigenvalue if the domain is a disk. We also give some rough bounds on the lowest magnetic eigenvalue of the disk. Running title: Magnetic Rayleigh-type inequality.

The solar torsional oscillations are considered as the response of the Reynolds stress to the time-dependent dynamo-induced magnetic eld. This picture is opposite to the so far accepted idea that it is the large-scale Lorentz force which directly drives the temporal variations of the surface rotation proole. Here, the \magnetic quenching" of the components of the Reynolds stress { viscosity ten...

We have identified and classified Zeeman pairs in the survey by Argon, Reid, & Menten of massive star-forming regions with 18 cm (Π3/2, J = 3/2) OH maser emission. We have found a total of more than 100 Zeeman pairs in more than 50 massive star-forming regions. The magnetic field deduced from the Zeeman splitting has allowed us to assign an overall line-of-sight magnetic field direction to many...