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Title:
Large-Angle Spectrometric Coronagraph Measurements of the Energetics of Coronal Mass Ejections
Authors:
Vourlidas, A.; Subramanian, P.; Dere, K. P.; Howard, R. A.
Affiliation:
AA(Center for Earth Observing and Space Research, Institute for Computational Sciences, George Mason University, Fairfax, VA 22030; ), AB(Center for Earth Observing and Space Research, Institute for Computational Sciences, George Mason University, Fairfax, VA 22030), AC(E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC 20375), AD(E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC 20375)
Publication:
The Astrophysical Journal, Volume 534, Issue 1, pp. 456-467. (ApJ Homepage)
Publication Date:
05/2000
Origin:
UCP
ApJ Keywords:
SUN: SOLAR-TERRESTRIAL RELATIONS, SUN: ACTIVITY, SUN: CORONA, SUN: MAGNETIC FIELDS
DOI:
10.1086/308747
Bibliographic Code:
2000ApJ...534..456V

Abstract

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 flux-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 flux-rope CMEs are magnetically driven. Furthermore, since their total energy is constant, the flux-rope parts of the CMEs can be considered a closed system above ~2 Rsolar.
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