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Ultraviolet Spectroscopy of a Coronal Mass Ejection

Published online by Cambridge University Press:  12 April 2016

A. Ciaravella ,
J.C. Raymond ,
S. Fineschi ,
L. Gardner ,
J. Michels ,
R. O’Neal ,
J. Kohl ,
M. Romoli ,
G. Noci  and
C. Benna
...Show all authors
A. Ciaravella
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
J.C. Raymond
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
S. Fineschi
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
L. Gardner
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
J. Michels
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
R. O’Neal
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
J. Kohl
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138
M. Romoli
Affiliation:
Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 5, 50125 Firenze, Italy
G. Noci
Affiliation:
Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 5, 50125 Firenze, Italy
C. Benna
Affiliation:
Università di Torino, I-10125 Torino, Italy
S. Giordano
Affiliation:
Università di Torino, I-10125 Torino, Italy
E. Antonucci
Affiliation:
Osservatorio Astronomico di Torino, 10125 Pino Torinese, Italy

Abstract

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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.

Type
Birth and Death of Filaments
Information
International Astronomical Union Colloquium , Volume 167: New Perspectives on Solar Prominences , 1998 , pp. 370 - 375
Copyright
Copyright © Astronomical Society of the Pacific 1998

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