Journal
ASTROPHYSICAL JOURNAL
Volume 534, Issue 1, Pages 456-467Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/308747
Keywords
solar-terrestrial relations; Sun : activity; Sun : corona; Sun : magnetic fields
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We examine the energetics of coronal mass ejections (CMEs) with data from the large-angle spectrometric coronagraphs (LASCO) on SOHO. The LASCO observations provide fairly direct measurements of the mass, velocity, and dimensions of CMEs. Using these basic measurements, we determine the potential and kinetic energies and their evolution for several CMEs that exhibit Bur-rope morphologies. Assuming flux conservation, we use observations of the magnetic flux in a variety of magnetic clouds near the Earth to determine the magnetic flux and magnetic energy in CMEs near the Sun. We find that the potential and kinetic energies increase at the expense of the magnetic energy as the CME moves out, keeping the total energy roughly constant. This demonstrates that Bur-rope CMEs are magnetically driven. Furthermore, since their total energy is constant, the Bur-rope parts of the CMEs can be considered a closed system above similar to 2 R-..
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