Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh41a1637w&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH41A-1637
Astronomy and Astrophysics
Astrophysics
[2101] Interplanetary Physics / Coronal Mass Ejections, [7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections
Scientific paper
The imagers on the two STEREO spacecraft are used to track the 2008 June 1 CME continuously from the Sun to 1 AU. We use these data to reconstruct the structure of the CME. The appearance of the CME changes significantly as it moves outwards, meaning that self-similar expansion does not apply and the CME must therefore be modeled as an evolving structure. We find that the CME's appearance can be reproduced by a flux rope with its west leg rotated 35 degrees below the ecliptic plane. The flux rope is initially rather fat, with a rounded top, but the flux rope gradually becomes thinner with time and its top flattens. This is a slow CME, which accelerates from 35 km/s at a Sun-center distance of 3.7 R_sun to 374 km/s at 26 R_sun, and then maintains that speed all the way out to 1 AU. Close to 1 AU the CME is observed to hit both STEREO-B and a comet (Comet C/2007 W1 Boattini). Our evolving CME model is not able to reproduce the timing of this to better than about 5 hours, illustrating the difficulties in extracting 3D kinematic information from 2D STEREO images.
Howard Russ A.
Socker Dennis G.
Wood Brian E.
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