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Measurements of Coronal Magnetic Field Strengths in Solar Active Region Loops View all abstracts by submitter

David Brooks   Submitted: 2021-07-06 20:20

The characteristic electron densities, temperatures, and thermal distributions of 1 MK active region loops are now fairly well established, but their coronal magnetic field strengths remain undetermined. Here we present measurements from a sample of coronal loops observed by the Extreme-ultraviolet Imaging Spectrometer on Hinode. We use a recently developed diagnostic technique that involves atomic radiation modeling of the contribution of a magnetically induced transition to the Fe x 257.262 Ĺ spectral line intensity. We find coronal magnetic field strengths in the range of 60–150 G. We discuss some aspects of these new results in the context of previous measurements using different spectropolarimetric techniques, and their influence on the derived Alfvén speeds and plasma β in coronal loops.

Authors: David H. Brooks, Harry P. Warren, Enrico Landi
Projects: Hinode/EIS

Publication Status: Published in ApJL 915 L24
Last Modified: 2021-07-07 02:25
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