Reconstruction of a helical prominence in 3D from IRIS spectra and images
| Autor: | R. Gravet, P. J. Levens, A. López Ariste, Maciej Zapiór, Brigitte Schmieder, Nicolas Labrosse |
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| Přispěvatelé: | 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 |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
010504 meteorology & atmospheric sciences
media_common.quotation_subject FOS: Physical sciences Context (language use) Astrophysics Ellipse 01 natural sciences Solar prominence symbols.namesake prominences 0103 physical sciences 010303 astronomy & astrophysics Spectrograph Image resolution Sun: magnetic fields Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences media_common Physics [PHYS]Physics [physics] Plane (geometry) Astronomy and Astrophysics Sun: UV radiation Sun: filaments Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Sky symbols [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Doppler effect |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, 2017, 606, pp.A30. ⟨10.1051/0004-6361/201730839⟩ Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 606, pp.A30. ⟨10.1051/0004-6361/201730839⟩ |
| ISSN: | 0004-6361 |
| DOI: | 10.1051/0004-6361/201730839⟩ |
| Popis: | Movies of prominences obtained by space instruments e.g. the Solar Optical Telescope (SOT) aboard the {\it Hinode} satellite and the Interface Region Imaging Spectrograph (IRIS) with high temporal and spatial resolution revealed the tremendous dynamical nature of prominences. { Knots of plasma belonging to prominences} appear to travel along both vertical and horizontal thread-like loops, with highly dynamical nature. The aim of the paper is to reconstruct the 3D shape of a helical prominence observed over two and a half hours by IRIS. From the IRIS \ion{Mg}{ii} k spectra we compute Doppler shifts of the plasma inside the prominence and from the slit-jaw images (SJI){ we derive the transverse field in the plane of the sky. Finally we obtain the velocity vector field of the knots in 3D. We reconstruct the real trajectories of nine knots travelling along ellipses. The spiral-like structure of the prominence observed in the plane of the sky is mainly due to the projection effect of long arches of threads (up to 8 $ \times 10^4$ km). Knots run along more or less horizontal threads with velocities reaching 65 km s$^{-1}$. The dominant driving force is the gas pressure. 14 pages, 16 figures, 3 movies |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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