Filling the far-side gap in a standard synoptic map with magnetograms taken 4 days later changes the simulated global corona, and that composite matches 2024 eclipse streamers and PSP proton data better than the standard map.
Detection of "diffuse" coronal He I 1083 during the April 8 2024 Solar Eclipse: evidence for terrestrial atmospheric scattering origin
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abstract
Strong He I 1083 nm atomic line signals have been previously measured during total solar eclipses at coronal heights above the lunar limb. This rather unexpected measurement has kindled a discussion about the hypothesized presence of significant amounts of neutral helium at coronal conditions. We performed spectroscopic observations of the He I 1083 nm spectroscopic region with the newly built CHEESE instrument during the April 8th 2024 total solar eclipse to test the presence of He I 1083 in the solar corona. We detected the He I 1083, the forbidden coronal line Fe XIII 1074.7 nm, as well as the chromospheric H I 1093.8 nm Paschen-{\gamma} line in our eclipse observations. The chromospheric He I 1083 and H I 1093.8 nm Paschen-{\gamma} lines are detected in the corona as well as on the lunar disc. Our findings point toward a non-solar origin of the He I 1083 signal during the April 8th 2024 eclipse that challenge the notion of abundant neutral helium in the solar corona inferred from eclipse observations.
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The Role of Far-side Magnetic Structures in Modeling 2024 Solar Eclipse
Filling the far-side gap in a standard synoptic map with magnetograms taken 4 days later changes the simulated global corona, and that composite matches 2024 eclipse streamers and PSP proton data better than the standard map.