Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.7304j&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #73.04; Bulletin of the American Astronomical Society, Vol. 29, p.1321
Astronomy and Astrophysics
Astronomy
Scientific paper
As part of SOHO Joint Observing Program 16 to study the solar formation of Helium, coordinated observations of a coronal hole were obtained on 17 Jan 97. In this paper, we compare the NSO/KPVT full-disk 1083 nm spectroheliogram and a time sequence of spectra-spectroheliograms of the coronal hole near the south solar pole with approximately cospatial and cotemporal SOHO spatial-spectral data taken in He I (58.4 nm, CDS and SUMER) and He II 30.4 nm (CDS) together with several transition-region and coronal lines of CIII, OIII, OIV, MgIX, MgX, SiIX, and SiXII. We have previously reported on correlations of line intensities. Here we concentrate as well on Doppler shifts and, in particular, line asymmetry in the He I 1083 nm line which shows augmented absorption in the blue wing of the line within the coronal hole in the same sense as reported by Dupree, Penn, and Jones (1996, ApJ 467, L121).
Andretta Vincenzo
Jones Philip H.
Jordan Stuart D.
Penn Matt J.
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