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Browsing by Author "Bianda, M"

Browsing by Author "Bianda, M"

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  • Analysis of the Forward-scattering Hanle Effect in the Ca I 4227 Å Line 
    Anusha, L. S; Nagendra, K. N; Bianda, M; Stenflo, J. O; Holzreuter, R; Sampoorna, M; Frisch, H; Ramelli, R; Smitha, H. N (IOP Publishing, 2011-08-20)
    Coherent scattering of limb-darkened radiation is responsible for the generation of the linearly polarized spectrum of the Sun (the Second Solar Spectrum). This Second Solar Spectrum is usually observed near the limb of ...
  • Center-to-limb Observations and Modeling of the Ca I 4227 Å Line 
    Supriya, H. D; Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Ramelli, R; Ravindra, B; Anusha, L. S (IOP Publishing, 2014-09-20)
    The observed center-to-limb variation (CLV) of the scattering polarization in different lines of the Second Solar Spectrum can be used to constrain the height variation of various atmospheric parameters, in particular the ...
  • Forward-scattering Hanle effect in the solar Ca i 4227 Å line 
    Frisch, H; Anusha, L. S; Bianda, M; Holzreuter, R; Nagendra, K. N; Ramelli, R; Sampoorna, M; Smitha, H. N; Stenflo, J. O (Cambridge University Press, 2012-06)
    High sensitivity spectropolarimetric observations of the four Stokes parameters of the solar Ca i 4227 Å line have been performed in October 2010 at IRSOL with the ZIMPOL polarimeter, near the disk center, outside an active ...
  • Generalization of the last scattering approximation for the second solar spectrum modeling: the Ca i 4227 å line as a case study 
    Anusha, L. S; Nagendra, K. N; Stenflo, J. O; Bianda, M; Sampoorna, M; Frisch, H; Holzreuter, R; Ramelli, R (IOP Publishing, 2010-08-01)
    To model the second solar spectrum (the linearly polarized spectrum of the Sun that is due to coherent scattering processes), one needs to solve the polarized radiative transfer (RT) equation. For strong resonance lines, ...
  • J-state interference signatures in the second solar spectrum. Modeling the Cr I triplet at 5204-5208 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Sampoorna, M; Ramelli, R; Anusha, L. S (EDP Sciences, 2012-05)
    The scattering polarization in the solar spectrum is traditionally modeled with each spectral line treated separately, but this is generally inadequate for multiplets where J-state interference plays a significant role. ...
  • Linear Polarization of the Solar Ca I 4227 Å Line: Modeling with Radiative Transfer and Last Scattering Approximation 
    Anusha, L. S; Stenflo, J. O; Frisch, H; Bianda, M; Holzreuter, R; Nagendra, K. N; Sampoorna, M; Ramelli, R (Astronomical Society of the Pacific, 2011-04)
    To model the Ca I 4227 Å line polarization, radiative transfer effects with partial frequency redistribution (PRD) must be taken into account. The numerical solution of the relevant polarized radiative transfer (RT) equations ...
  • Observations of the forward scattering Hanle effect in the Ca I  4227 Å  line 
    Bianda, M; Ramelli, R; Anusha, L. S; Stenflo, J. O; Nagendra, K. N; Holzreuter, R; Sampoorna, M; Frisch, H; Smitha, H. N (EDP Sciences, 2011-06)
    Chromospheric magnetic fields are notoriously difficult to measure. The chromospheric lines are broad, while the fields are producing a minuscule Zeeman-effect polarization. A promising diagnostic alternative is provided ...
  • Observations of the Solar Ca I 4227 Å Line 
    Bianda, M; Ramelli, R; Stenflo, J. O; Anusha, L. S; Nagendra, K. N; Sampoorna, M; Holzreuter, R; Frisch, H (Astronomical Society of the Pacific, 2011-04)
    Our aim is to understand some interesting polarization features observed in the solar Ca I 4277 Å line. Here we only discuss the observational aspects. Observations have also been made in other chromospheric lines within ...
  • Origin of spatial variations of scattering polarization in the wings of the Ca I 4227 Å line 
    Sampoorna, M; Stenflo, J. O; Nagendra, K. N; Bianda, M; Ramelli, R; Anusha, L. S (The American Astronomical Society, 2009-07-10)
    Polarization that is produced by coherent scattering can be modified by magnetic fields via the Hanle effect. This has opened a window to explorations of solar magnetism in parameter domains not accessible to the Zeeman ...
  • The Quantum Interference Effects in the Sc II 4247 Å Line of the Second Solar Spectrum 
    Smitha, H. N; Nagendra, K. N; Stenflo, J. O; Bianda, M; Ramelli, R (IOP Publishing, 2014-10-10)
    The Sc II 4247 Å line formed in the chromosphere is one of the lines well known, like the Na I D2 and Ba II D2, for its prominent triple-peak structure in Q/I and the underlying quantum interference effects governing it. ...

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