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Ultraviolet Spectroscopy of a Coronal Mass Ejection

  • A. Ciaravella (a1), J.C. Raymond (a1), S. Fineschi (a1), L. Gardner (a1), J. Michels (a1), R. O’Neal (a1), J. Kohl (a1), M. Romoli (a2), G. Noci (a2), C. Benna (a3), S. Giordano (a3) and E. Antonucci (a4)...

Abstract

A coronal mass ejection (CME) event was observed on December 23, 1996 with the Ultraviolet Coronagraph Spectrometer in both ultraviolet and visible light channels at 0.5 R over the solar limb. The CME was followed during its evolution in the bright lines of Lyα (1216Å), Lyβ (1026Å), Lyγ (972Å), C III (977Å) and the OVI doublet (1032, 1037Å) and in several weaker lines. The Lyα peak intensity shows an excursion of two orders of magnitude during the CME evolution, and blue shifts up to 0.8Å (~200 km/sec). The data provide the emission measure in the Log T range 4.0–5.5 with a 0.3 sampling. Line intensities and profiles have been measured, providing important diagnostics for a detailed study of the CME’s physical and dynamical parameters.

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References

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Antonucci, E. et al. 1997a, Adv. Space Res., in press
Antonucci, E. et al. 1997b, ApJL, 490, 183.
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