Coronal models and detection of the open magnetic field

Asvestari, E. ORCID: https://orcid.org/0000-0002-6998-7224, Temmer, M. ORCID: https://orcid.org/0000-0003-4867-7558, Caplan, R. M. ORCID: https://orcid.org/0000-0002-2633-4290, Linker, J. A. ORCID: https://orcid.org/0000-0003-1662-3328, Heinemann, S. G. ORCID: https://orcid.org/0000-0002-2655-2108, Pinto, R. F. ORCID: https://orcid.org/0000-0001-8247-7168, Henney, C. J. ORCID: https://orcid.org/0000-0002-6038-6369, Arge, C. N., Owens, M. J. ORCID: https://orcid.org/0000-0003-2061-2453, Madjarska, M. S. ORCID: https://orcid.org/0000-0001-9806-2485, Pomoell, J. ORCID: https://orcid.org/0000-0003-1175-7124, Hofmeister, S. J. ORCID: https://orcid.org/0000-0001-7662-1960, Scolini, C. ORCID: https://orcid.org/0000-0002-5681-0526 and Samara, E. ORCID: https://orcid.org/0000-0002-7676-9364 (2024) Coronal models and detection of the open magnetic field. The Astrophysical Journal, 971 (1). 45. ISSN 1538-4357 doi: 10.3847/1538-4357/ad5155

Abstract/Summary

A plethora of coronal models, from empirical to more complex magnetohydrodynamic (MHD) ones, are being used for reconstructing the coronal magnetic field topology and estimating the open magnetic flux. However, no individual solution fully agrees with coronal hole observations and in situ measurements of open flux at 1 au, as there is a strong deficit between the model and observations contributing to the known problem of the missing open flux. In this paper, we investigate the possible origin of the discrepancy between modeled and observed magnetic field topology by assessing the effect on the simulation output by the choice of the input boundary conditions and the simulation setup, including the choice of numerical schemes and the parameter initialization. In the frame of this work, we considered four potential field source surface-based models and one fully MHD model, different types of global magnetic field maps, and model initiation parameters. After assessing the model outputs using a variety of metrics, we conclude that they are highly comparable regardless of the differences set at initiation. When comparing all models to coronal hole boundaries extracted by extreme-ultraviolet filtergrams, we find that they do not compare well. This mismatch between observed and modeled regions of the open field is a candidate contributing to the open flux problem.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/118671
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher	American Astronomical Society
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