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Measuring relative abundances in the solar corona with optimised linear combinations of spectral lines  

Natalia ZAMBRANA PRADO   Submitted: 2019-11-25 06:49

Context. Elemental abundances in some coronal structures differ significantly from photospheric abundances, with a dependence on the first ionization potential (FIP) of the element. Measuring these FIP-dependent abundance biases is important for coronal and heliospheric physics. Aims. We aim to build a method for optimal determination of FIP biases in the corona from spectroscopic observations in a way that is in practice independent from differential emission measure (DEM) inversions. Methods. We optimised linear combinations of spectroscopic lines of low-FIP and high-FIP elements so that the ratio of the corresponding radiances yields the relative FIP bias with good accuracy for any DEM in a small set of typical DEMs. Results. These optimised linear combinations of lines allow retrieval of a test FIP bias map with good accuracy for all DEMs in the map. The results also compare well with a FIP bias map obtained from observations using a DEM-dependent method. Conclusions. The method provides a convenient, fast, and accurate way of computing relative FIP bias maps. It can be used to optimise the use of existing observations and the design of new observations and instruments.

Authors: Zambrana Prado Natalia, Buchlin ?ric
Projects: Hinode/EIS,SDO-AIA

Publication Status: Published
Last Modified: 2019-11-25 14:15
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Measuring relative abundances in the solar corona with optimised linear combinations of spectral lines

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