Abstract
The SOHO Ultraviolet Coronagraph Spectrometer (UYCS/SOHO) is being used to observe the extended solar corona from 1.25 to 10 R from Sun center. Initial observations of polar coronal holes and equatorial streamers are described. The observations include measurements of spectral line profiles for H I Lα and Lβ, O VI 1032 Å and 1037 Å, Mg × 625 Å, Fe XII 1242 Å and several others. Intensities for Mg × 610 Å, Si XII 499 Å, and 520 Å, S × 1196 Å, and 22 others have been observed. Preliminary results for derived H0, O5+, Mg9+, and Fe11+ velocity distributions and initial indications of outflow velocities for O5+ are described. In streamers, the H0 velocity distribution along the line of sight (specified by the value at e-1, along the line of sight) decreases from a maximum value of about 180 km s-1 at 2 R to about 140 km s-1 at 8 R. The value for O5+ increases with height reaching a value of 150 km s-1 at 4.7 R. In polar coronal holes, the O5+ velocity at e-1 is atout equal to that of H0 at 1.7 R and significantly larger at 2.1 R. The O5+ in both streamers and coronal holes were found to have amsotropic velocity distributions with the smaller values in the radial direction.
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Kohl, J.L. et al. (1997). First Results from the SOHO Ultraviolet Coronagraph Spectrometer. In: Fleck, B., Švestka, Z. (eds) The First Results from SOHO. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5236-5_34
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DOI: https://doi.org/10.1007/978-94-011-5236-5_34
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