Multi-scale observations of thermal non-equilibrium cycles in coronal loops
| Autor: | Vasco Manuel de Jorge Henriques, Clara Froment, L. Rouppe van der Voort, Patrick Antolin, Petra Kohutova |
|---|---|
| Přispěvatelé: | University of Oslo (UiO), Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), 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 d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-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 d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), University of Northumbria at Newcastle [United Kingdom] |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
chromosphere
010504 meteorology & atmospheric sciences F300 FOS: Physical sciences F500 Astrophysics 01 natural sciences Spectral line UV radiation 0103 physical sciences Thermal Coronal rain Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences Physics Condensation Sun Astronomy and Astrophysics Coronal loop Solar telescope Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science [SDU]Sciences of the Universe [physics] Coronal plane Physics::Space Physics atmosphere corona Intensity (heat transfer) |
| Zdroj: | Astronomy and Astrophysics-A&A Astronomy and Astrophysics-A&A, EDP Sciences, 2020, 633, pp.A11. ⟨10.1051/0004-6361/201936717⟩ |
| ISSN: | 0004-6361 |
| Popis: | Thermal non-equilibrium (TNE) is a phenomenon that can occur in solar coronal loops when the heating is quasi-constant and highly-stratified. Under such heating conditions, coronal loops undergo cycles of evaporation and condensation. The recent observations of ubiquitous long-period intensity pulsations in coronal loops and their relationship with coronal rain have demonstrated that understanding the characteristics of TNE cycles is an essential step in constraining the circulation of mass and energy in the corona. We report unique observations with the Solar Dynamics Observatory (SDO) and the Swedish 1-m Solar Telescope (SST) that link the captured thermal properties across the extreme spatiotemporal scales covered by TNE processes. Within the same coronal loop bundle, we captured 6 hr period coronal intensity pulsations in SDO/AIA and coronal rain observed off-limb in the chromospheric Halpha and Ca II K spectral lines with SST/CRISP and SST/CHROMIS. We combined a multi-thermal analysis of the cycles with AIA and an extensive spectral characterisation of the rain clumps with the SST. We find clear evidence of evaporation-condensation cycles in the corona which are linked with periodic coronal rain showers. The high-resolution spectroscopic instruments at the SST reveal the fine-structured rain strands and allow us to probe the cooling phase of one of the cycles down to chromospheric temperatures. These observations reinforce the link between long-period intensity pulsations and coronal rain. They also demonstrate the capability of TNE to shape the dynamics of active regions on the large scales as well as on the smallest scales currently resolvable. 19 pages, 16 figures, accepted for publication in A&A |
| Databáze: | OpenAIRE |
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