Justification of the use of Stokes-V Cryo-NIRSP/DKIST observations for the 3D Reconstruction of the Coronal Magnetic Field

TL;DR

This paper demonstrates that incorporating Stokes-V data from Cryo-NIRSP/DKIST significantly enhances the accuracy of 3D coronal magnetic field reconstructions compared to using only linear polarization data, based on MHD simulations.

Contribution

It provides a justification for using Cryo-NIRSP/DKIST Stokes-V observations to improve 3D coronal magnetic field reconstructions.

Findings

Stokes-V data improves 3D magnetic field reconstruction accuracy.

Cryo-NIRSP FOV coverage enhances reconstruction over active regions.

Inclusion of Stokes-V data outperforms tomography with only linear polarization.

Abstract

This study presents a justification of the use of Stokes-V Cryo-NIRSP/DKIST observations for the 3D Reconstruction of the Coronal Magnetic Field. A magnetohydrodynamic (MHD) model of the solar corona during solar minimum generated by Predictive Science Inc. was used to synthesize spectropolarimetric measurements of the Fe XIII 1075 nm coronal emission line as observed from the Earth. Stokes-Q,U data is "taken" for half a solar rotation period (about two weeks) by Upgraded Coronal Multichannel Polarimeter (UCoMP) with field of view (FOV) up to $2\ R_\odot$. Stokes-V data is "taken" once a day for two days by Cryo-NIRSP/DKIST with a total FOV equal to the two Cryo-NIRSP FOVs. We demonstrated that even this amount Stokes-V observations with Cryo-NIRSP FOV coverage can remarkably improve the 3D coronal magnetic field reconstruction over an active region compared with tomography reconstruction based only on UCoMP linear polarization data.