3D Reconstruction of an Erupting Prominence

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3D Reconstruction of an Erupting Prominence

• William Thompson
• Adnet Systems, Inc. / NASA GSFC

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Introduction

• A bright prominence associated with a CME was
  seen erupting from the Sun on April 9, 2008.
  This promince was tracked in both the STEREO EUVI
  and COR1 telescopes, and was seen to undergo
  complex churning motions as it erupted.
• The separation of the two STEREO spacecraft at
  this time was 48 degrees. Co-identification of
  features in both views is quite difficult with
  such a large separation. However, it was
  possible to match some sharp features in the
  later part of the eruption as seen in the 304 A
  line in EUVI.

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Ha image of the filament on the disk several days
before the eruption. The original orientation is
24 to the horizontal.
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Data Analysis

• The following images show the tracked features as
  seen in EUVI-A. An attempt was made to track the
  same features at each timestamp however, not all
  features were visible at all times. SCC_MEASURE
  was used to derive the 3D coordinates of each
  trace.
• Because the measurements are made in 3D, they can
  be reprojected to another viewpoint. The plots
  to the right show the same data as in the images,
  but from a viewpoint where the CME is traveling
  straight toward the observer. The data are shown
  in anaglyph format, so that the third dimension
  can also be seen when viewed with red-blue
  glasses. However, the major aspects of the data
  can be seen without special glasses.

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The prominence alignment seen in COR1 corresponds
to that seen in the last frames of the EUVI data.
This alignment is basically maintained
throughout the COR1 field of view, with no
additional rotation of the prominence, or a small
amount of reverse rotation.
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This figure shows the estimated orientation of
the prominence as a function of time. The
original orientation based on the Ha image from
several days before is also shown.
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Courtesy B. Kliem, T. Toeroek
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Courtesy B. Kliem, T. Toeroek