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Related Experiment Videos

Three-dimensional polarimetric imaging of coronal mass ejections.

Thomas G Moran1, Joseph M Davila

  • 1National Aeronautics and Space Administration (NASA) Goddard Space Flight Center, Code 682.3, Greenbelt, MD 20770, USA. moran@orpheus.nascom.nasa.gov [correction]

Science (New York, N.Y.)
|May 29, 2004
PubMed
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We reconstructed coronal mass ejections (CMEs) in 3D using polarization analysis. This revealed complex structures for loop-like CMEs and expanding loop arcades for halo CMEs.

Area of Science:

  • Solar physics
  • Plasma astrophysics

Background:

  • Coronal mass ejections (CMEs) are large expulsions of plasma and magnetic field from the Sun's corona.
  • Understanding CME structure is crucial for space weather prediction.

Purpose of the Study:

  • To reconstruct the three-dimensional (3D) structure of coronal mass ejections (CMEs).
  • To analyze the morphology and dynamics of different CME types.

Main Methods:

  • Utilized polarization analysis of single-view images from the Large Angle and Spectrometric Coronagraph (LASCO) C2 instrument on the Solar and Heliospheric Observatory (SOHO) spacecraft.
  • Developed 3D reconstruction techniques based on polarization signatures.

Main Results:

  • Successfully reconstructed a loop-like CME, revealing a complex 3D structure.

Related Experiment Videos

  • Determined the loop-like CME was centered 40 degrees from the plane of the sky and moved radially at 250 km/s.
  • Reconstructed two halo CMEs, indicating they are expanding loop arcades.

    • Conclusions:

    • Polarization analysis enables robust 3D CME reconstructions from single-view coronagraph data.
    • The study provides new insights into the complex 3D morphology of CMEs, differentiating between loop-like and halo events.