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Enforcing divergence-free magnetic fields from spectropolarimetric observations

Published on:

2 April 2024

Primary Category:

Solar and Stellar Astrophysics

Paper Authors:

Juan M. Borrero,

Adur Pastor Yabar,

Basilio Ruiz Cobo

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Key Details

Develops method to strictly impose zero magnetic field divergence

Implemented in FIRTEZ inversion code for Hinode/SP observations

Solenoidal field fits observed polarization as well as non-solenoidal field

Better fit to Stokes I versus worse fit to Stokes V with solenoidal field

Deviations suggest uncertainties in components cause non-zero divergence

AI generated summary

Enforcing divergence-free magnetic fields from spectropolarimetric observations

This paper develops a new technique to retrieve magnetic fields from spectropolarimetric observations that satisfy Maxwell's equations requiring divergence-free fields. It is implemented in the FIRTEZ inversion code and applied to Hinode/SP observations. Results show the solenoidal field fits observed polarization comparably while improving physical realism. Deviations correlate with worse fits to circular polarization signals in some areas, suggesting uncertainties in field components mainly cause non-zero divergences in regular inversions.

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