MAGNETIC FIELD IN ATYPICAL PROMINENCE STRUCTURES: BUBBLE, TORNADO, AND ERUPTION
| Autor: | Nicolas Labrosse, Brigitte Schmieder, B. Gelly, Kévin Dalmasse, P. J. Levens, A. López Ariste |
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| Přispěvatelé: | Observatoire de Paris - Site de Paris (OP), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Télescope héliographique pour l'étude du magnétisme et des instabilites solaires (THEMIS), Centre National de la Recherche Scientifique (CNRS), University of Glasgow, National Center for Atmospheric Research [Boulder] (NCAR) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Hanle effect
010504 meteorology & atmospheric sciences Field (physics) Magnetism FOS: Physical sciences Astrophysics 01 natural sciences Solar prominence symbols.namesake 0103 physical sciences Stokes parameters 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Line (formation) Physics [PHYS]Physics [physics] Astronomy and Astrophysics Plasma Magnetic field Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science symbols [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
| Zdroj: | The Astrophysical Journal The Astrophysical Journal, American Astronomical Society, 2016, 826 (2), pp.164. ⟨10.3847/0004-637X/826/2/164⟩ The Astrophysical Journal, 2016, 826 (2), pp.164. ⟨10.3847/0004-637X/826/2/164⟩ |
| ISSN: | 0004-637X 1538-4357 |
| DOI: | 10.3847/0004-637X/826/2/164⟩ |
| Popis: | Spectropolarimetric observations of prominences have been obtained with the THEMIS telescope during four years of coordinated campaigns. Our aim is now to understand the conditions of the cool plasma and magnetism in `atypical' prominences, namely when the measured inclination of the magnetic field departs, to some extent, from the predominantly horizontal field found in `typical' prominences. What is the role of the magnetic field in these prominence types? Are plasma dynamics more important in these cases than the magnetic support? We focus our study on three types of `atypical' prominences (tornadoes, bubbles and jet-like prominence eruptions) that have all been observed by THEMIS in the He I D_3 line, from which the Stokes parameters can be derived. The magnetic field strength, inclination and azimuth in each pixel are obtained by using the Principal Component Analysis inversion method on a model of single scattering in the presence of the Hanle effect. The magnetic field in tornadoes is found to be more or less horizontal, whereas for the eruptive prominence it is mostly vertical. We estimate a tendency towards higher values of magnetic field strength inside the bubbles than outside in the surrounding prominence. In all of the models in our database, only one magnetic field orientation is considered for each pixel. While sufficient for most of the main prominence body, this assumption appears to be oversimplified in atypical prominence structures. We should consider these observations as the result of superposition of multiple magnetic fields, possibly even with a turbulent field component. Comment: 13 pages, 9 figures |
| Databáze: | OpenAIRE |
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