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On the Physical Nature of the so-Called Prominence Tornadoes

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    0572864 - ASÚ 2024 RIV DE eng J - Článek v odborném periodiku
    Gunár, Stanislav - Labrosse, N. - Luna, M. - Schmieder, B. - Heinzel, Petr - Kucera, T. A. - Levens, P. - Ariste, A.L. - Mackay, D. H. - Zapiór, Maciej
    On the Physical Nature of the so-Called Prominence Tornadoes.
    Space Science Reviews. Roč. 219, č. 4 (2023), č. článku 33. ISSN 0038-6308. E-ISSN 1572-9672
    Grant CEP: GA ČR(CZ) GA22-34841S
    Institucionální podpora: RVO:67985815
    Klíčová slova: solar prominences * observational diagnostics * spectroscopy * Modelling
    Obor OECD: Astronomy (including astrophysics,space science)
    Impakt faktor: 10.3, rok: 2022
    Způsob publikování: Open access

    The term 'tornado' has been used in recent years to describe several solar phenomena, from large-scale eruptive prominences to small-scale photospheric vortices. It has also been applied to the generally stable quiescent prominences, sparking a renewed interest in what historically was called 'prominence tornadoes'. This paper carries out an in-depth review of the physical nature of 'prominence tornadoes', where their name subconsciously makes us think of violent rotational dynamics. However, after careful consideration and analysis of the published observational data and theoretical models, we conclude that 'prominence tornadoes' do not differ in any substantial way from other stable solar prominences. There is simply no unequivocal observational evidence of sustained and coherent rotational movements in quiescent prominences that would justify a distinct category of prominences sharing the name with the well-known atmospheric phenomenon. The visual impression of the column-like silhouettes, the perceived helical motions, or the suggestive Doppler-shift patterns all have a simpler, more likely explanation. They are a consequence of projection effects combined with the presence of oscillations and/or counter-streaming flows. 'Prominence tornadoes' are thus just manifestations of the complex nature of solar prominences when observed in specific projections. These coincidental viewing angles, together with the presence of fine-structure dynamics and simple yet profoundly distorting projection effects, may sometimes play havoc with our intuitive understanding of perceived shapes and motions, leading to the incorrect analogy with atmospheric tornadoes.
    Trvalý link: https://hdl.handle.net/11104/0343830

     
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