55 citations · 411 across the 23 of their papers we have counts for
24 papers
1.5D investigation of the Hanle effect in the Ca I 4227 line using partial frequency redistribution. Comparison of synthetic Stokes profiles in Bifrost and MURaM-ChE rMHD models
Devang Agnihotri, L. S. Anusha, D. Przybylski +2
Modeling scattering polarization in the Ca I 4227 Å line is important for diagnosing chromospheric magnetic fields. We investigate the relative influence of formation heights and m…
Clustering analysis of Ca {\sc i} 4227 line polarization using magnetohydrodynamic simulations of the solar atmosphere
Harsh Mathur, L. S. Anusha, Devang Agnihotri
Ca {\sc i} 4227 Å\, line is a strong resonance line formed in the Solar chromosphere. At the limb, it produces the largest scattering polarization signal. So far, modeling the line…
Chromospheric Extension of the MURaM Code
D. Przybylski, R. Cameron, S. K. Solanki +5
Detailed numerical models of chromosphere and corona are required to understand the heating of the solar atmosphere. An accurate treatment of the solar chromosphere is complicated…
MPS-ATLAS: A fast all-in-one code for synthesising stellar spectra
V. Witzke, A. I. Shapiro, M. Cernetic +6
Context. Stellar spectral synthesis is essential for various applications, ranging from determining stellar parameters to comprehensive stellar variability calculations. New observ…
Radiative transfer with opacity distribution functions: Application to narrow band filters
L. S. Anusha, A. I. Shapiro, V. Witzke +3
Modelling of stellar radiative intensities in various spectral pass-bands plays an important role in stellar physics. At the same time the direct calculations of the high-resolutio…
Non-equilibrium Equation of State in stellar atmospheres
L. S. Anusha, M. van Noort, R. H. Cameron
In the stellar chromospheres, radiative energy transport is dominated by only the strongest spectral lines. For these lines, the approximation of local thermodynamic equilibrium (L…
The Dimmest State of the Sun
K. L. Yeo, S. K. Solanki, N. A. Krivova +5
How the solar electromagnetic energy entering the Earth's atmosphere varied since pre-industrial times is an important consideration in the climate change debate. Detrimental to th…
Power spectrum of turbulent convection in the solar photosphere
L. Yelles Chaouche, R. H. Cameron, S. K. Solanki +15
The solar photosphere provides us with a laboratory for understanding turbulence in a layer where the fundamental processes of transport vary rapidly and a strongly superadiabatic…
Importance of Angle-dependent Partial Frequency Redistribution in Hyperfine Structure Transitions Under Incomplete Paschen-Back Effect Regime
K. N. Nagendra, K. Sowmya, M. Sampoorna +2
Angle-frequency coupling in scattering of polarized light on atoms is represented by the angle-dependent (AD) partial frequency redistribution (PRD) matrices. There are several lin…
Resonance Line Polarization in Spherically Symmetric Moving Media: a Parametric Study
A. Megha, M. Sampoorna, K. N. Nagendra +2
In the present paper we consider the problem of resonance line polarization formed in the spherically symmetric expanding atmospheres. For the solution of the concerned polarized t…
Polarized Line Formation in Arbitrary Strength Magnetic Fields: the case of a two-level atom with hyperfine structure splitting
M. Sampoorna, K. N. Nagendra, K. Sowmya +2
Quantum interference effects together with partial frequency redistribution (PFR) in line scattering produce subtle signatures in the so called Second Solar Spectrum (the linearly…
Estimation of the magnetic flux emergence rate in the quiet Sun from Sunrise data
H. N. Smitha, L. S. Anusha, S. K. Solanki +1
Small-scale internetwork (IN) features are thought to be the major source of fresh magnetic flux in the quiet Sun. During its first science flight in 2009, the balloon-borne observ…
Statistical evolution of quiet-Sun small scale magnetic features using Sunrise observations
L. S. Anusha, Sami K. Solanki, Johann Hirzberger +1
The evolution of small magnetic features in quiet regions of the Sun provides a unique window to probing solar magneto-convection. Here we analyze small scale magnetic features in…
Effect of cross-redistribution on the resonance scattering polarization of O {\sc i} line at 1302 Å\,
L. S. Anusha, K. N. Nagendra, H. Uitenbroek
Oxygen is the most abundant element on the Sun after Hydrogen and Helium. The intensity spectrum of resonance lines of neutral Oxygen namely O {\sc i} (1302, 1305 and 1306 Å\,) has…
Center to limb observations and modeling of the Ca I 4227 A line
H. D. Supriya, H. N. Smitha, K. N. Nagendra +5
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…
Polarized Line Formation in Multi-dimensional Media. IV. A Fourier Decomposition Technique To Formulate The Transfer Equation With Angle-Dependent Partial Frequency Redistribution
L. S. Anusha, K. N. Nagendra
To explain the linear polarization observed in spatially resolved structures in the solar atmosphere, the solution of polarized radiative transfer (RT) equation in multi-dimensiona…
Polarized Line Formation in Multi-dimensional Media. V. Effects of Angle-Dependent Partial Frequency Redistribution
L. S. Anusha, K. N. Nagendra
The solution of polarized radiative transfer equation with angle-dependent (AD) partial frequency redistribution (PRD) is a challenging problem. Modeling the observed, linearly pol…
Multi-dimensional radiative transfer to analyze Hanle effect in Ca {\sc ii} K line at 3933 Å\,
L. S. Anusha, K. N. Nagendra
Radiative transfer (RT) studies of the linearly polarized spectrum of the Sun (the second solar spectrum) have generally focused on the line formation, with an aim to understand th…
An efficient decomposition technique to solve angle-dependent Hanle scattering problems
H. D. Supriya, M. Sampoorna, K. N. Nagendra +2
Hanle scattering is an important diagnostic tool to study weak solar magnetic fields. Partial frequency redistribution (PRD) is necessary to interpret the linear polarization obser…
J-state interference signatures in the Second Solar Spectrum: Modeling the Cr I triplet at 5204-5208 A
H. N. Smitha, K. N. Nagendra, J. O. Stenflo +4
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…
Polarized Line Formation in Multi-Dimensional Media.III. Hanle Effect with Partial Frequency Redistribution
L. S. Anusha, K. N. Nagendra
In the previous two papers, namely, \citet{anuknn11} and \citet{anuetal11} we solved the polarized radiative transfer (RT) equation in multi-dimensional (multi-D) geometries, with…
Observations of the forward scattering Hanle effect in the Ca i 4227 Å line
M. Bianda, R. Ramelli, L. S. Anusha +6
Chromospheric magnetic fields are notoriously diffcult to measure. The chromospheric lines are broad, while the fields are producing a minuscule Zeeman-effect polarization. A promi…
Preconditioned Bi-Conjugate Gradient Method for Radiative Transfer in Spherical Media
L. S. Anusha, K. N. Nagendra, F. Paletou +1
A robust numerical method called the Preconditioned Bi-Conjugate Gradient (Pre-BiCG)method is proposed for the solution of radiative transfer equation in spherical geometry.A varia…
Origin of spatial variations of scattering polarization in the wings of the Ca {\sc i} 4227 Åline
M. Sampoorna, J. O. Stenflo, K. N. Nagendra +3
Polarization that is produced by coherent scattering can be modified by magnetic fields via the Hanle effect. According to standard theory the Hanle effect should only be operating…