Data · dataset · 2026
Comparison of inversion codes for polarized line formation in MHD simulations. I. Milne-Eddington codes
Listed in National Center for Atmospheric Research
Milne-Eddington (M-E) inversion codes for the radiative transfer equation are the most widely used tools to infer the magnetic field from observations of the polarization signals in photospheric and chromospheric spectral lines.
Description
Unfortunately, a comprehensive comparison between the different M-E codes available to the solar physics community is still missing, and so is a physical interpretation of their inferences. In this contribution we offer a comparison between three of those codes (VFISV, ASP/HAO, and HeLIx+).
These codes are used to invert synthetic Stokes profiles that were previously obtained from realistic non-grey three-dimensional magnetohydrodynamical (3D MHD) simulations. The results of the inversion are compared with each other and with those from the MHD simulations. In the first case, the M-E codes retrieve values for the magnetic field strength, inclination and line-of-sight velocity that agree with each other within ÏB ⤠35 (Gauss), Ïγ ⤠1.2°, and Ïv ⤠10 mâsâ»Â¹, respectively.
Read the rest (1 more)
Additionally, M-E inversion codes agree with the numerical simulations, when compared at a fixed optical depth, within ÏB ⤠130 (Gauss), Ïγ ⤠5°, and Ïv ⤠320 mâsâ»Â¹. Finally, we show that employing generalized response functions to determine the height at which M-E codes measure physical parameters is more meaningful than comparing at a fixed geometrical height or optical depth. In this case the differences between M-E inferences and the 3D MHD simulations decrease to ÏB ⤠90 (Gauss), Ïγ ⤠3°, and Ïv ⤠90 mâsâ»Â¹.
Links
Get the data
- Publisher page n2t.org/ark:/85065/d7p55phz ↗
documentation · download · from data ucar edu
Where it is published
- data.ucar.edu /dataset/comparison-of-inversion-codes-for-polarized-line-forma… ↗
National Center for Atmospheric Research dataset page
landing page · from data ucar edu
Catalogue records · 1
- CKAN API data.ucar.edu/api/3/action/package_show?id=f52979bd-fc0e-42e5-adf2-d87439352… ↗
metadata API · from data ucar edu
Topics
- From keywords
- Earth & Environmental Science · Ocean & Atmospheric Science
Provenance · 1 source records, 7 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| National Center for Atmospheric Research | f52979bd-fc0e-42e5-adf2-d87439352f02 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| concepts[field].local:field:earth-environmental | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| concepts[field].local:field:ocean-atmospheric | mapping · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| created_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| description | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /notes |
| publication_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 | |
| title | source · data ucar edu | connector:data_ucar_edu@1.0.0 | /title |
| updated_date | source · data ucar edu | connector:data_ucar_edu@1.0.0 |