The Color and Brightness of the F-Corona Inferred from the 2019 July 2 Total Solar Eclipse
| Autor: | Benjamin Boe, Shadia Rifai Habbal, Miloslav Druckmüller, Cooper Downs |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Brightness Photosphere Solar observatory 010504 meteorology & atmospheric sciences Solar eclipse FOS: Physical sciences Astronomy and Astrophysics Solar radius Astrophysics 01 natural sciences Corona Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science 0103 physical sciences Magnetohydrodynamics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Eclipse |
| DOI: | 10.48550/arxiv.2103.02113 |
| Popis: | Total solar eclipses (TSEs) provide a unique opportunity to quantify the properties of the K-corona (electrons), F-corona (dust) and E-corona (ions) continuously from the solar surface out to a few solar radii. We apply a novel inversion method to separate emission from the K- and F-corona continua using unpolarized total brightness (tB) observations from five 0.5 nm bandpasses acquired during the 2019 July 2 TSE between 529.5 nm and 788.4 nm. The wavelength dependence relative to the photosphere (i.e., color) of the F-corona itself is used to infer the tB of the K- and F-corona for each line-of-sight. We compare our K-corona emission results with the Mauna Loa Solar Observatory (MLSO) K-Cor polarized brightness (pB) observations from the day of the eclipse, and the forward modeled K-corona intensity from the Predictive Science Inc. (PSI) Magnetohydrodynamic (MHD) model prediction. Our results are generally consistent with previous work and match both the MLSO data and PSI-MHD predictions quite well, supporting the validity of our approach and of the PSI-MHD model. However, we find that the tB of the F-corona is higher than expected in the low corona, perhaps indicating that the F-corona is slightly polarized -- challenging the common assumption that the F-corona is entirely unpolarized. Comment: 25 pages, 9 figures, accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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