ANGEO Annales Geophysicae ANGEO Ann. Geophys. 1432-0576 Copernicus Publications Göttingen, Germany 10.5194/angeo-29-1019-2011 On the influence of CMEs on the global 3-D coronal electron density Kramar M. 1 2 Davila J. 2 Xie H. 1 2 Antiochos S. 2 Physics Department, The Catholic University of America, 620 Michigan Ave NE, Washington, D.C. 20064, USA NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 15 06 2011 29 6 1019 1028 Copyright: © 2011 M. Kramar et al. 2011 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://angeo.copernicus.org/articles/29/1019/2011/angeo-29-1019-2011.html The full text article is available as a PDF file from https://angeo.copernicus.org/articles/29/1019/2011/angeo-29-1019-2011.pdf

In order to analize the influence of a Coronal Mass Ejection (CME) on the coronal streamer belt, we made 3-D reconstructions of the electron density in the corona at heliospheric distances from 1.5 to 4 <I>R</I><sub>&odot;</sub> for periods before and after a CME occured. The reconstructions were performed using a tomography technique. We studied two CME cases: (i) a slow CME on 1 June 2008; (ii) two fast CMEs on 31 December 2007 and 2 January 2008. For the first case of slow CME, it was found: (i) the potential magnetic field configuration in the CME initiation region before the CME does not agree with the coronal density structure while after the CME the agreement between the field and density is much better. This could be manifistation of that that the field was non-potential before the CME and after the CME the field relaxes towards a more potential state. (ii) It was shown that the dimming caused by the slow CME is not due to rotation of the corona and a line-of-sight (LOS) effect but a streamer blow out effect took place.

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