The magnetic sensitivity of the resonance and subordinate lines of Mg II in the solar chromosphere

Abstract

We carry out a theoretical study of the polarization of the solar Mg II h-k doublet (including its extended wings) and the subordinate UV triplet around 280 nm. These lines are of great diagnostic interest, as they encode information on the physical properties of the solar atmosphere from the upper photosphere to the chromosphere-corona transition region. We base our study on radiative transfer calculations of spectral line polarization in one-dimensional models of quiet and plage regions of the solar atmosphere. Our calculations take into account the combined action of atomic polarization, quantum level interference, frequency redistribution, and magnetic fields of arbitrary strength. In particular, we study the sensitivity of the emergent Stokes profiles to changes in the magnetic field through the Zeeman and Hanle effects. We also study the impact of the chromospheric plasma dynamics on the emergent Stokes profiles, taking into account the angle-dependent frequency redistribution in the h-k resonance transitions. The results presented here are of interest for the interpretation of spectropolarimetric observations in this important region of the solar ultraviolet spectrum.

References in corpus (11)

• An Interface Region Imaging Spectrograph first view on Solar Spicules
• Magnetic Diagnostics of the Solar Chromosphere with the Mg II h-k Lines
• The magnetic sensitivity of the Mg ii k line to the joint action of Hanle, Zeeman and magneto-optical effects
• The Hanle and Zeeman polarization signals of the solar Ca II 8542 Å line
• The transfer of resonance line polarization with partial frequency redistribution and J-state interference
• Scattering polarization in the CaII Infrared Triplet with Velocity Gradients
• Depolarizing collisions with hydrogen: neutral and singly ionized alkaline earths
• Explicit Form of the Radiative and Collisional Branching Ratios in Polarized Radiation Transport with Coherent Scattering
• A Note on the Radiative and Collisional Branching Ratios in Polarized Radiation Transport with Coherent Scattering
• Spectropolarimetry of the Solar Mg II h and k Lines
• Laboratory Frequency Redistribution Function for the Polarized $\Lambda$-Type Three-Term Atom

Cited by in corpus (23)

• Mapping Solar Magnetic Fields from the Photosphere to the Base of the Corona
• TIC: A Stokes inversion code for scattering polarization with partial frequency redistribution and arbitrary magnetic fields
• Measuring the magnetic origins of solar flares, CMEs and Space Weather
• The effects of three-dimensional radiative transfer on the resonance polarization of the Ca I 4227 $\mathring{\mathrm{A}}$ line
• Modeling the scattering polarization of the solar Ca i 4227 Å line with angle-dependent partial frequency redistribution
• Tomography of a solar plage with the Tenerife Inversion Code
• The transfer of polarized radiation in resonance lines with partial frequency redistribution, J-state interference, and arbitrary magnetic fields. A radiative transfer code and useful approximations
• Numerical solutions to linear transfer problems of polarized radiation I. Algebraic formulation and stationary iterative methods
• Optimal spectral lines for measuring chromospheric magnetic fields
• The circular polarization of the Mn I resonance lines around 280 nm for exploring chromospheric magnetism
• The impact of limited time resolution on the forward-scattering polarization in the solar Sr I 4607 Å line
• Formation of the Mg II h and k polarization profiles in a solar plage model and their suitability to infer magnetic fields
• Importance of Angle-dependent Partial Frequency Redistribution in Hyperfine Structure Transitions Under Incomplete Paschen-Back Effect Regime
• The magnetic sensitivity of the (250-278nm) Fe II polarization spectrum
• Evidence for the Operation of the Hanle and Magneto-Optical Effects in the Scattering Polarization Signals Observed by CLASP2 Across the Mg II h and k Lines
• Assessment of the CRD approximation for the observer's frame RIII redistribution matrix
• A numerical approach for modelling the polarisation signals of strong resonance lines with partial frequency redistribution. Numerical applications to two-term atoms and plane-parallel atmospheres
• Determining the Magnetic Field in the Atmosphere of a Solar Active Region Observed by the CLASP2.1 Sounding Rocket Experiment
• Magnetic field diagnostics of prominences with the Mg II k line: 3D Stokes inversions versus traditional methods
• Fast and accurate approximation of the angle-averaged redistribution function for polarized radiation
• Derivation of Instrument Requirements for Polarimetry using Mg, Fe, and Mn lines between 250 and 290 nm
• The magnetic sensitivity of the Ca II resonance and subordinate lines in the solar atmosphere
• The polarization angle in the wings of Ca i 4227: A new observable for diagnosing unresolved photospheric magnetic fields