Physics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997soph..175..613k&link_type=abstract
Solar Physics, Volume 175, Issue 2, pp.613-644
Physics
279
Scientific paper
The SOHO Ultraviolet Coronagraph Spectrometer (UVCS/SOHO) is being used to observe the extended solar corona from 1.25 to 10 R&sun; from Sun center. Initial observations of polar coronal holes and equatorial streamers are described. The observations include measurements of spectral line profiles for HI Lα and Lβ, Ovi 1032 Å and 1037 Å, Mgx 625 Å, Fexii 1242 Å and several others. Intensities for Mgx 610 Å, Sixii 499 Å, and 520 Å, Sx 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&sun; to about 140 km s-1 at 8 R&sun;. The value for O5+ increases with height reaching a value of 150 km s-1 at 4.7 R&sun;. In polar coronal holes, the O5+ velocity at e-1 is about equal to that of H0 at 1.7 R&sun; and significantly larger at 2.1 R&sun;. The O5+ in both streamers and coronal holes were found to have anisotropic velocity distributions with the smaller values in the radial direction.
Antonucci Ester
Benna Carlo
Ciaravella Angela
Cranmer Steven R.
Fineschi Silvano
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