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Title: SOLAR PROMINENCES: “DOUBLE, DOUBLE… BOIL AND BUBBLE”

Observations revealed rich dynamics within prominences, the cool (10{sup 4} K), macroscopic (sizes of order 100 Mm) “clouds” in the million degree solar corona. Even quiescent prominences are continuously perturbed by hot, rising bubbles. Since prominence matter is hundredfold denser than coronal plasma, this bubbling is related to Rayleigh–Taylor instabilities. Here we report on true macroscopic simulations well into this bubbling phase, adopting an MHD description from chromospheric layers up to 30 Mm height. Our virtual prominences rapidly establish fully nonlinear (magneto)convective motions where hot bubbles interplay with falling pillars, with dynamical details including upwelling pillars forming within bubbles. Our simulations show impacting Rayleigh–Taylor fingers reflecting on transition region plasma, ensuring that cool, dense chromospheric material gets mixed with prominence matter up to very large heights. This offers an explanation for the return mass cycle mystery for prominence material. Synthetic views at extreme ultraviolet wavelengths show remarkable agreement with observations, with clear indications of shear-flow induced fragmentations.
Authors:
;  [1] ;  [2]
  1. Centre for mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven, Celestijnenlaan 200 B, B-3001 Leuven (Belgium)
  2. Department of Applied Mathematics, The University of Leeds, Leeds, LS2 9JT (United Kingdom)
Publication Date:
OSTI Identifier:
22518961
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 806; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BUBBLES; CHROMOSPHERE; COMPUTERIZED SIMULATION; EXTREME ULTRAVIOLET RADIATION; FILAMENTS; LAYERS; MAGNETOHYDRODYNAMICS; MASS; NONLINEAR PROBLEMS; PLASMA; RAYLEIGH-TAYLOR INSTABILITY; SHEAR; SOLAR CORONA; SOLAR PROMINENCES; SUN