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Modeling UV and X-Ray Emission in a Post-CME Current Sheet View all abstracts by submitter

Yuan-Kuen Ko   Submitted: 2010-08-09 10:15

A post-CME current sheet (CS) is a common feature developed behind an erupting flux rope in CME models. Observationally, white light observations have recorded many occurrences of a thin ray appearing behind a CME eruption that closely resembles a post-CME CS in its spatial correspondence and morphology. UV and X-ray observations further strengthen this interpretation by the observations of high temperature emission at locations consistent with model predictions. The next question then becomes whether the properties inside a post-CME current sheet predicted by a model agree with observed properties. In this work, we assume that the post-CME CS is a consequence of Petschek-like reconnection and that the observed ray-like structure is bounded by a pair of slow mode shocks developed from the reconnection site. We perform time-dependent ionization calculations and model the UV line emission. We find that such a model is consistent with SOHO/UVCS observations of the post-CME CS. The change of Fe XVIII emission in one event implies an inflow speed of ~10 km s-1 and a corresponding reconnection rate of M_A ~0.01. We calculate the expected X-ray emission for comparison with X-ray observations by Hinode/XRT, as well as the ionic charge states as would be measured in-situ at 1 AU. We find that the predicted count rate for Hinode/XRT agree with what was observed in a post-CME CS on April 9, 2008, and the predicted ionic charge states are consistent with high ionization states commonly measured in the interplanetary CMEs. The model results depend strongly on the physical parameters in the ambient corona, namely the coronal magnetic field, the electron density and temperature during the CME event. It is crucial to obtain these ambient coronal parameters and as many facets of the CS properties as possible by observational means so that the post-CME current sheet models can be scrutinized more effectively.

Authors: Yuan-Kuen Ko, John C. Raymond, Bojan Vrsnak, Eugen Vujic
Projects: None

Publication Status: Accepted for publication in the Astrophysical Journal
Last Modified: 2010-08-12 09:46
Go to main E-Print page  Time Evolution of Coronal Magnetic Helicity in the Flaring Active Region NOAA 10930  Toward understanding the early stages of an impulsively accelerated coronal mass ejection  Edit Entry  Download Preprint  Delete Entry 

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