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The evolving sigmoid: evidence for magnetic flux ropes in the corona before, during, and after CMEs View all abstracts by submitter

Sarah Gibson   Submitted: 2007-03-07 12:41

It is generally accepted that the energy that drives coronal mass ejections (CMEs) is magnetic in origin. Sheared and twisted coronal fields can store free magnetic energy which ultimately is released in the CME. We explore the possibility of the specific magnetic configuration of a magnetic flux rope of field lines that twist about an axial field line. The flux rope model predicts coronal observables, including heating along forward or inverse S-shaped, or sigmoid, topological surfaces. Therefore, studying the observed evolution of such sigmoids prior to, during, and after the CME gives us crucial insight into the physics of coronal storage and release of magnetic energy. In particular, we consider (1) soft-X-ray sigmoids, both transient and persistent; (2) The formation of a current sheet and cusp-shaped post-flare loops below the CME; (3) Reappearance of sigmoids after CMEs; (4) Partially erupting filaments; (5) Magnetic cloud observations of filament material.

Authors: S. E. Gibson, Y. Fan, T. Toeroek, and B. Kliem
Projects: None

Publication Status: Space Science Reviews, 124, 131, 2007
Last Modified: 2007-03-07 12:50
Go to main E-Print page  Partially-ejected flux ropes: implications for space weather  Tilts and polarity separation in the sunspot groups and active regions at the ascending and descending phases of the cycle 23  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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