Solar Polarization (Astrophysics and Space Science Library) de K.N. Nagendra

Solar Polarization: Astrophysics and Space Science Library, cartea 243

K.N. Nagendra

Jan Olof Stenflo

Novel instruments for high-precision imaging polarimetry have opened new possibilities, not only for diagnostics of magnetic fields, but also for exploring effects in radiative scattering, atomic physics, spectral line formation and radiative transfer. The observational advances have stimulated various theoretical developments, for instance in vector radiative transfer and techniques for inverting polarized line profiles. The present volume gives a comprehensive and up-to-date account of this rapidly evolving and interdisciplinary field of science. It is based on the oral presentations given at the 2nd International Workshop on Solar Polarization held in Bangalore, India, in October 1998.

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Cuprins

Solar magnetism and the second solar spectrum: Future directions.- Scattering polarization in the chromosphere.- Observations of the Hanle effect in the Ca I 4227 and Sr II 4078 Å lines.- The density matrix theory for polarized radiation redistribution: Extensions for multilevel atom model and quantum Doppler effect.- Evidence for ground-level atomic polarization in the solar atmosphere.- Towards the modelling of the second solar spectrum.- Resonance polarization and Hanle effect: The integral equation formulation and some applications.- Polarized redistribution matrix for Hanle effect: Numerical tests.- An operator perturbation method for polarized line transfer IV: Applications to the Hanle effect with partial frequency redistribution.- The Hanle effect in 1D, 2D and 3D.- Exponential solutions to the radiative transfer equation for polarized light.- Continuum polarization and blend lines in the solar spectrum.- Effect of waves on resonance scattering polarization in solar atmosphere.- Polarized radiation transfer in 2D geometry.- 3D polarised radiative transfer with weak magnetic fields.- Three-dimensional radiative transfer with multilevel atoms.- The Hermitian solution of the radiative transfer equation for non-LTE problems.- Polarised formal solvers: Numerical properties and performance.- The current status of the MISMA hypothesis.- A new diagnostic tool for the solar chromosphere.- An LTE code for the inversion of Stokes spectra from solar magnetic elements.- Inversion of Stokes profiles.- Relationship between the line formation depth and stratification of vector magnetic fields in the solar atmosphere.- First results from Zimpol II.- Stokes profile reconstruction with the imaging vector magnetograph.- Measurement of instrumental polarisation of the Kodaikanaltunnel tower telescope.- Circular polarization measurement using a tunable lithium niobate Fabry-Perot filter.- Scientific highlights from the Solar and Heliospheric Observatory.- Sunspot magnetic oscillations: Comparison between observations and models.- Doppler redistribution of resonance polarization of the O VI 103.2 nm line observed above a polar hole.- Coronal polarization from solar eclipse observations.- Relationship between the green-line corona polarization and coronal magnetic fields.- On the stability of small-scale magnetic elements in the quiet photospheric network.- On the expansion of large and small flux tubes with height.- 2D radiative equilibrium models of magnetic flux tubes.- Estimation of magnetic field components in prominence using magneto hydrodynamic model.- Impact polarization of the H? line during solar flares.- Impact polarization and charge exchange as diagnostics of proton beams in solar flares.- The linear polarization in moustaches.- Broadband linear polarisation of CP stars: A sky survey in the southern hemisphere.- Mapping magnetic fields of Cp stars from Stokes I and V observations.- Transfer of polarized radiation in hydrogen lines in dense magnetized plasmas.- Magnetic field diagnosis in Ap stars through analysis of spectropolarimetric observations with the moment technique.- On the correlation between polarization and brightness in the RV Tauri star AR Puppis.- Modeling magnetic fields on stars other than the Sun.- List of Poster Papers.- Author Index.- List of Participants.