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SFB 591 » Projekte » B2
 

Title

Interaction of electromagnetic radiation with colloidal plasmas

Project manager

Prof. Dr. Rolf Chini
Astronomisches Institut
Ruhr-Universität Bochum

Prof. Dr. Jörg Winter
Institut für Experimentalphysik II
Anwendungsorientierte Plasmaphysik
Ruhr-Universität Bochum

Prof. Dr. Dr. hc. Padma Kant Shukla
Institut für Theoretische Physik IV
Weltraum- und Astrophysik
Ruhr-Universität Bochum

Mitarbeiter »

  Summary
  Goals

Magnetic fields play a crucial role in the universe, although many mechanisms, with which they Finally the education and the dynamics of coherent, nonlinear structures in an inhomogenous dusty Magnetoplasma are to be studied: In the center structures are located such as Solitonen, shocks, blocking layers, plasma and Staubl&oecher and eddies. Analytic and numeric results are to be compared with measurements of space and laboratory plasmas qualitatively and quantitatively.arise, are still not understood to a large extent. For e.g. magnetic fields stabilize molecule clouds against the gravitativen collapse, affect the gas-dust-coupling and affect the form of cloud fragments; all these parameters are of great importance for the star-forming process. In accretion-discs they contribute to the dissipation of the angular momentum and they participate in the formation of jets and outward flows. The largest difficulty however arises in the proof of interstellar magnetic fields, in particular in areas of high density, where optical and NIR methods fail. Here measurements of polarized submm emission do open a new possibility of diagnostics, since this emission arises only in cold, dens areas and confusion by diffuse material in the rear and foreground doesn't play any role. New observations let us assume, that the polarized, thermal emission from dust particles could serve as the best, direct indicator for the magnetic field structure in dense areas and possibly also seve as the key for dynamic, so far still not understood processes.

In physics too, the dynamics of non spherical, paramagnetic particles in plamas with magnetic fields are a current, but so far still little worked on basic question within the topic range "dusty plasmas". In this context, the optical characteristics of the individual particles themselves are still to a large extent unknown, so that important, in astronomy relevant parameters such as mass and temperature of dust particles can only be approximated very difficultly. Aspects of the long-range coupling and the formation of order conditions of the dust particles (coulomb crystals) as well as the development of asymmetries and preferred directions with effects on the reciprocal effect on the plasma and radiation fields are not yet investigated.

Experimental and theoretical investigations on questions of the dynamics of non-spherical dust particles in magnetized plasmas, the formation of turbulence (e.g. LH-driftwave-instability) or the structurization of vortices together with the light scattering by rotating, elongated as well as porous particles are therefore of great importance for the fundamental undestanding of dusty plasmas and complex phenomena in astrophysical objects.

The main goals consist of the following three topics

  1. Construction of a polarimeter and observation of the polarization of radiation of astronomical objects within the range between 350 and 2000μm. Correlation with large-scale magnetic fields. Interpretation within the context mentioned under point II and III.
  2. Inclusion of elongated as well as porous dust particle with and without magnetic moment in a plasma with magnetic field superposition as well as measurement of the particle dynamics and the effect on the polarisation of the light scattert by the particles.
  3. The dispersion characteristics of inhomogenous, self-gravitating astrophysical magneto-plasmas with ferrousmagnetic dust particles are to be examined on the basis of analytic and numeric procedures. Both, local and non-local dispersionrelations are to be derived and analyzed.
 
 
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