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Browsing by Author "Anusha, L. S"

Browsing by Author "Anusha, L. S"

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  • Polarized line formation in spherically symmetric atmospheres with velocity fields 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (IOP Publishing, 2019-07-01)
    The plane–parallel approximation of the stellar atmospheres cannot be applied to model the formation of optically thick lines formed in extended atmospheres. To a good approximation these atmospheres can be represented by ...
  • Polarized line formation in spherically symmetric expanding atmospheres 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (Astronomical Society of the Pacific, 2019-07)
    We consider the problem of polarized line formation in the spherically symmetric expanding atmospheres. The velocity fields in line forming regions produce Doppler shift, aberration of photons and also gives rise to ...
  • Polarized line formation with incomplete Paschen-Back effect and partial frequency redistribution 
    Sampoorna, M; Nagendra, K. N; Sowmya, K; Stenflo, J. O; Anusha, L. S (Astronomical Society of the Pacific, 2019-07)
    Quantum interference between the hyperfine structure states is known to depolarize the cores of some of the lines in the linearly polarized spectrum of the Sun (the Second Solar Spectrum). The presence of external magnetic ...
  • Preconditioned bi-conjugate gradient method for radiative transfer in spherical media 
    Anusha, L. S; Nagendra, K. N; Paletou, F; Leger, L (American Astronomical Society, 2009-10-10)
    A robust numerical method called the Preconditioned Bi-Conjugate Gradient (Pre-BiCG) method is proposed for the solution of the radiative transfer equation in spherical geometry. A variant of this method called Stabilized ...
  • Projection methods for line radiative transfer in spherical media 
    Anusha, L. S; Nagendra, K. N (Societa Astronomica Italiana, 2009)
    An efficient numerical method called the Preconditioned Bi-Conjugate Gradient (Pre-BiCG) method is presented for the solution of radiative transfer equation in spherical geometry. A variant of this method called Stabilized ...
  • Recent Developments in Polarized Line Formation in Magnetic Fields 
    Nagendra, K. N; Sampoorna, M; Anusha, L. S (Springer, 2010)
    The nature of solar surface magnetism has been an open problem in solar physics. In this paper we address three frontline problems of spectropolarimetry of the Sun. We first review the theoretical formulation and numerical ...

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