H-alpha features with hot onsets III. Fibrils in Lyman-alpha and with ALMA
Autor: | Rutten, Robert J. |
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Rok vydání: | 2016 |
Předmět: | |
Zdroj: | A&A 598, A89 (2017) |
Druh dokumentu: | Working Paper |
DOI: | 10.1051/0004-6361/201629238 |
Popis: | In H-alpha most of the solar surface is covered by dense canopies of long opaque fibrils, but predictions for quiet-Sun observations with ALMA have ignored this fact. Comparison with Ly-alpha suggests that the large opacity of H-alpha fibrils is caused by hot precursor events. Application of a recipe that assumes momentary Saha-Boltzmann extinction during their hot onset to millimeter wavelengths suggests that ALMA will observe H-alpha-like fibril canopies, not acoustic shocks underneath, and will yield data more interesting than if these canopies were transparent. Comment: Accepted for Astronomy & Astrophysics; Figure 1 corrected |
Databáze: | arXiv |
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