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<p>Strong He&#xa0;<span>i</span> 1083&#xa0;nm atomic line signals have previously been measured during total solar eclipses at coronal heights above the lunar limb. These rather unexpected measurements have kindled a discussion about the suggested presence of significant amounts of neutral helium at coronal conditions. We performed spectroscopic observations of the He&#xa0;<span>i</span> 1083&#xa0;nm wavelength region during the April 8th, 2024 total solar eclipse, using an instrument specifically designed to test the presence of He&#xa0;<span>i</span> 1083 in the solar corona. We were able to detect the He&#xa0;<span>i</span> 1083 line, the forbidden coronal line of Fe&#xa0;<span>xiii</span> at 1074.7&#xa0;nm, as well as the chromospheric H&#xa0;<span>i</span> 1093.8&#xa0;nm (Paschen-<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11207_2025_2500_Article_IEq1.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="13" /> </InlineMediaObject> <EquationSource Format="MATHML"><math> <mi>γ</mi> </math></EquationSource> <EquationSource Format="TEX">$\gamma $</EquationSource> </InlineEquation>) line in our data. The chromospheric He&#xa0;<span>i</span> 1083&#xa0;nm and H&#xa0;<span>i</span> 1093.8&#xa0;nm lines were detected in both the corona and on the lunar disc. We hypothesize that our observations support a terrestrial atmospheric scattering of the solar flash spectrum as the origin of the He&#xa0;<span>i</span> 1083 signal during the April 8th, 2024 eclipse. Our findings challenge the notion of abundant neutral helium in the solar corona suggested by previous eclipse observations.</p>

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Detection of “Diffuse” Coronal He I 1083 During the April 8, 2024 Solar Eclipse: Evidence for Terrestrial Atmospheric Scattering Contribution

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Momchil E. Molnar,
  • Roberto Casini,
  • Paul Bryans,
  • Ben Berkey,
  • Kalista Tyson

摘要

Strong He i 1083 nm atomic line signals have previously been measured during total solar eclipses at coronal heights above the lunar limb. These rather unexpected measurements have kindled a discussion about the suggested presence of significant amounts of neutral helium at coronal conditions. We performed spectroscopic observations of the He i 1083 nm wavelength region during the April 8th, 2024 total solar eclipse, using an instrument specifically designed to test the presence of He i 1083 in the solar corona. We were able to detect the He i 1083 line, the forbidden coronal line of Fe xiii at 1074.7 nm, as well as the chromospheric H i 1093.8 nm (Paschen- γ $\gamma $ ) line in our data. The chromospheric He i 1083 nm and H i 1093.8 nm lines were detected in both the corona and on the lunar disc. We hypothesize that our observations support a terrestrial atmospheric scattering of the solar flash spectrum as the origin of the He i 1083 signal during the April 8th, 2024 eclipse. Our findings challenge the notion of abundant neutral helium in the solar corona suggested by previous eclipse observations.