The first dedicated observation of an off-limb prominence by the Spectral Imaging of the Coronal Environment (SPICE) instrument took place on April 15, 2023. We aim to create parameter maps on the prominence region, including temperature, pressure, and column mass, by studying the integrated intensity of the Lyman β and Lyman γ lines from SPICE data. After constraining the altitude and radial velocity in the prominence, we use a 1D non-LTE radiative transfer code to generate 1000 random models and compute the Lyman β and Lyman γ line profiles. The computed intensities are compared with observed integrated intensities from SPICE. Then, we create models which simultaneously give a reasonable match with the observed intensities in both lines. Unlike previous approaches, our method uses contribution functions to guide the optimisation of temperature and pressure profiles. Our approach enables a physically constrained and consistent match to both spectral lines. The method in this paper enables us to generate models from pixels on the prominence region and use this information to generate parameter maps. The results obtained have potential for future research.
@article{arxiv.2604.14063,
title = {Prominence Plasma Parameters Maps Inferred From Lyman $\beta$ and Lyman $\gamma$ Observations and Non-LTE Modelling},
author = {Y. Zhang and N. Labrosse and T. A. Kucera and S. Parenti},
journal= {arXiv preprint arXiv:2604.14063},
year = {2026}
}