On helium line polarization during the impulsive phase of an X1 flare

2015/10/30 by P. G. Judge, Judge, Philip G., Lucia Kleint +3
Physics and Astronomy · #Astro and Planetary Science #FOS: Physical sciences #Solar and Space Plasma Dynamics #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies

paper · pdf · doi:10.48550/arxiv.1510.09218

openalex publication_date 2015/10/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We analyze spectropolarimetric data of the He I 1083~nm multiplet (1s2s~³ S₁ - 1s2p~³ P^o_2,1,0) during the X1 flare SOL2014-03-29T17:48, obtained with the Facility Infrared Spectrometer (FIRS) at the Dunn Solar Telescope. While scanning active region NOAA 12017, the FIRS slit crossed a flare ribbon during the impulsive phase, when the helium line intensities turned into emission at

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