Atomic Structure Calculations of Landé g Factors of Astrophysical Interest with Direct Applications for Solar Coronal Magnetometry

2021 ◽  
Vol 923 (2) ◽  
pp. 186
Author(s):  
Sacha Schiffmann ◽  
Tomas Brage ◽  
Philip Gordon Judge ◽  
Alin Razvan Paraschiv ◽  
Kai Wang
Keyword(s):  
Magnetic Fields ◽  
Solar Corona ◽  
Atomic Structure ◽  
Theoretical Study ◽  
Solar Telescope ◽  
Coronal Magnetic Fields ◽  
Infrared Wavelengths ◽  
Atomic Structure Calculations ◽  
New Instruments ◽  
Structure Calculations

Abstract We perform a detailed theoretical study of the atomic structure of ions with ns 2 np m ground configurations and focus on departures from LS coupling, which directly affect the Landé g factors of magnetic dipole lines between levels of the ground terms. Particular emphasis is given to astrophysically abundant ions formed in the solar corona (those with n = 2,3) with M1 transitions spanning a broad range of wavelengths. Accurate Landé g factors are needed to diagnose coronal magnetic fields using measurements from new instruments operating at visible and infrared wavelengths, such as the Daniel K. Inouye Solar Telescope. We emphasize an explanation of the dynamics of atomic structure effects for nonspecialists.

Calculated Coronal Magnetic Fields and Their Comparison with the Coronal Structures as Observed during Five Solar Eclipses

1994 ◽  
Vol 144 ◽  
pp. 559-564
Author(s):  
P. Ambrož ◽  
J. Sýkora
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Magnetic Fields ◽  
Solar Corona ◽  
Coronal Magnetic Field ◽  
Coronal Magnetic Fields ◽  
Solar Eclipses ◽  
Coronal Structures

AbstractWe were successful in observing the solar corona during five solar eclipses (1973-1991). For the eclipse days the coronal magnetic field was calculated by extrapolation from the photosphere. Comparison of the observed and calculated coronal structures is carried out and some peculiarities of this comparison, related to the different phases of the solar cycle, are presented.

scholarly journals Towards B-Spline Atomic Structure Calculations

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 50
Author(s):  
Charlotte Froese Fischer
Keyword(s):  
Atomic Structure ◽  
Bound States ◽  
Virial Theorem ◽  
B Spline ◽  
B Splines ◽  
Self Consistent ◽  
History Of ◽  
Consistent Method ◽  
Atomic Structure Calculations ◽  
Structure Calculations

The paper reviews the history of B-spline methods for atomic structure calculations for bound states. It highlights various aspects of the variational method, particularly with regard to the orthogonality requirements, the iterative self-consistent method, the eigenvalue problem, and the related sphf, dbsr-hf, and spmchf programs. B-splines facilitate the mapping of solutions from one grid to another. The following paper describes a two-stage approach where the goal of the first stage is to determine parameters of the problem, such as the range and approximate values of the orbitals, after which the level of accuracy is raised. Once convergence has been achieved the Virial Theorem, which is evaluated as a check for accuracy. For exact solutions, the V/T ratio for a non-relativistic calculation is −2.

scholarly journals Atomic Structure Calculations and Study of Plasma Parameters of Al-Like Ions

Atoms ◽  
2016 ◽  
Vol 4 (3) ◽  
pp. 22 ◽  
Author(s):  
Arun Goyal ◽  
Indu Khatri ◽  
Avnindra Singh ◽  
Man Mohan ◽  
Rinku Sharma ◽  
...  
Keyword(s):  
Atomic Structure ◽  
Plasma Parameters ◽  
Atomic Structure Calculations ◽  
Structure Calculations

Relativistic atomic structure calculations and study of plasma parameters for Na-like Se XXIV

2019 ◽  
Vol 26 (6) ◽  
pp. 062704 ◽  
Author(s):  
A. K. Singh ◽  
Dishu Dawra ◽  
Mayank Dimri ◽  
Alok K. S. Jha ◽  
Man Mohan
Keyword(s):  
Atomic Structure ◽  
Plasma Parameters ◽  
Atomic Structure Calculations ◽  
Structure Calculations

scholarly journals Numerical Procedures for Relativistic Atomic Structure Calculations

Atoms ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 85
Author(s):  
Charlotte Froese Fischer ◽  
Andrew Senchuk
Keyword(s):  
Variational Methods ◽  
Atomic Structure ◽  
Finite Differences ◽  
Heavy Elements ◽  
Transition Rates ◽  
Numerical Accuracy ◽  
Hartree Fock ◽  
Atomic Structure Calculations ◽  
Structure Calculations

Variational methods are used extensively in the calculation of transition rates for numerous lines in a spectrum. In the GRASP code, solutions of the multiconfiguration Dirac–Hartree–Fock (MCDHF) equations that optimize the orbitals are represented by numerical values on a grid using finite differences for integration and differentiation. The numerical accuracy and efficiency of existing procedures are evaluated and some modifications proposed with heavy elements in mind.

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