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Development of a Current Sheet in the Wake of a Fast CME View all abstracts by submitter

David Webb   Submitted: 2014-01-06 09:18

A bright ray that developed in the wake of a fast coronal massejection (CME)on 2005 September 7 presents a unique opportunity to study the earlydevelopmentand physical characteristics of a reconnecting current sheet.Polarizationbrightness images from the Mk4 K-Coronameter at the Mauna Loa SolarObservatory(MLSO) are used to determine the structure of the ray along its axis lowin the corona as it progressed outward. Coverage of the earlydevelopment of theray out to ~1.3 R⊙ for a period of ~27 hours after the start ofthe event enablesfor the first time in white light a measurement of a CME current sheetfrom thetop of the arcade to the base of the flux rope. Measured widths of theray arecombined to obtain the kinematics of the upper and lower ''Y'' pointsdescribedin reconnection flux-rope models such as Lin and Forbes (2000). Thetime dependenceof these points are used to derive values for the speed and accelerationof the growth of the current sheet. We note the appearance of a largestructurewhich increases in size as it expands outward in the early developmentof the ray,and an apparent oscillation with period of ~0.5 hour in the positionangle of theray.

Authors: A.G. Ling, D. F. Webb, J. T. Burkepile, E. W. Cliver
Projects: MLSO Mk4 K-Coronameter

Publication Status: ApJ Accepted
Last Modified: 2014-01-06 09:18
Go to main E-Print page  Distribution of Electric Currents in Solar Active Regions  Magnetic Configurations Related to the Coronal Heating and Solar Wind Generation I. Twist and Expansion Profiles of Magnetic Loops Produced by Flux Emergence  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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