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Title: Investigating the dynamics and density evolution of returning plasma blobs from the 2011 June 7 eruption

This work examines in-falling matter following an enormous coronal mass ejection on 2011 June 7. The material formed discrete concentrations, or blobs, in the corona and fell back to the surface, appearing as dark clouds against the bright corona. In this work we examined the density and dynamic evolution of these blobs in order to formally assess the intriguing morphology displayed throughout their descent. The blobs were studied in five wavelengths (94, 131, 171, 193, and 211 Å) using the Solar Dynamics Observatory Atmospheric Imaging Assembly, comparing background emission to attenuated emission as a function of wavelength to calculate column densities across the descent of four separate blobs. We found the material to have a column density of hydrogen of approximately 2 × 10{sup 19} cm{sup –2}, which is comparable with typical pre-eruption filament column densities. Repeated splitting of the returning material is seen in a manner consistent with the Rayleigh-Taylor instability. Furthermore, the observed distribution of density and its evolution is also a signature of this instability. By approximating the three-dimensional geometry (with data from STEREO-A), volumetric densities were found to be approximately 2 × 10{sup –14} g cm{sup –3}, and this, along with observed dominant length scales ofmore » the instability, was used to infer a magnetic field of the order 1 G associated with the descending blobs.« less
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Mullard Space Science Laboratory, University College London, Holmbury St Mary, Surrey, RH5 6NT (United Kingdom)
  2. Max-Planck Institut für Sonnensystemforschung, D-37191 Katlenburg-Lindau (Germany)
  3. Kwasan and Hida Observatories, Kyoto University, Kyoto 607-8471 (Japan)
Publication Date:
OSTI Identifier:
22351424
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 782; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; APPROXIMATIONS; COMPARATIVE EVALUATIONS; CONCENTRATION RATIO; DENSITY; DISTRIBUTION; ERUPTION; EVOLUTION; FILAMENTS; HYDROGEN; MAGNETIC FIELDS; MASS; PLASMA; RAYLEIGH-TAYLOR INSTABILITY; SUN; SURFACES; THREE-DIMENSIONAL CALCULATIONS; ULTRAVIOLET RADIATION; WAVELENGTHS