Ultraviolet and Optical Observations of a Coronal Transient with SOHO

Details Ultraviolet and Optical Observations of a Coronal Transient with SOHO Ultraviolet and Optical Observations of a Coronal Transient with SOHO

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510.1053c&link_type=abstract

The Astrophysical Journal, Volume 510, Issue 2, pp. 1053-1063.

Astronomy and Astrophysics

Astronomy

14

Sun: Corona, Sun: Uv Radiation

Scientific paper

A coronal transient was observed on 1997 March 6 at 1.6 R_solar over an active region on the east limb. We observed both the edge of horizontally compressed gas and the diffuse curtain of coronal material. The region was monitored for 4 hr, and the H I Lyalpha, O VI lambdalambda1031.91, 1037.61, N V lambdalambda1242.80, 1238.80, and O V] lambda1218.35 lines were detected during the ejection evolution. The density, velocity, temperature, and oxygen abundance of the ejected plasma have been obtained from the observed spectra. Intermediate temperature lines of N V, O VI, and O V show a large enhancement, suggesting a quite narrow range of plasma temperature around 4x10^5 K. Doppler shifts of the ejected material evolve from an initial blueshift of 100 km s^-1 to a redshift of 145 km s^-1. The outflow velocity, as determined by Doppler dimming analysis of the O VI doublet, is only about 20 km s^-1.

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