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UVCS Observations of a Helical CME Structure

Published online by Cambridge University Press:  03 June 2005

R. M. Suleiman ,
N. U. Crooker ,
J. C. Raymond  and
A. van Ballegooijen
R. M. Suleiman
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,Cambridge, MA 02138, USA Center for Space Physics, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA
N. U. Crooker
Affiliation:
Center for Space Physics, Boston University, 725 Commonwealth Avenue, Boston, MA 02215, USA
J. C. Raymond
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,Cambridge, MA 02138, USA
A. van Ballegooijen
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street,Cambridge, MA 02138, USA
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Abstract

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A helical structure in the coronal mass ejection (CME) of 12 September 2000 was observed by the Ultraviolet Coronagraph Spectrometer (UVCS) aboard the Solar and Heliospheric Observatory (SOHO) at heliocentric distances of 3.5 and 6 R$_{\odot}$. A difference of 300 km sec$^{-1}$ in line-of-sight velocities for two segments of the helix obtained from Doppler measurements implies expansion and allows one to distinguish which segment was closest to the observer. The tilt of the segment then determines the handedness. Observed Ly$\alpha$ and C III line emissions indicate that the helix was threaded with filament plasma of varying density. While the helix constituted the bright core of filament plasma, the helix itself was most likely not the pre-existing filament structure.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Keywords

Sun: coronaSun: coronal mass ejections (CMEs)Sun: filamentsSun: UV radiation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUS226 , September 2004 , pp. 71 - 75
Copyright
© 2005 International Astronomical Union