Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996acasn..37..336l&link_type=abstract
Acta Astron. Sin., Vol. 37, No. 3, p. 336 - 338
Astronomy and Astrophysics
Astronomy
2
Solar Coronal Holes: Spectra, Solar Spectrum: Helium Lines
Scientific paper
The authors obtained a batch of 2-dimensional He I 10830 spectra of solar polar areas. Preliminary analysis shows that some He I 10830 "dark points" and coronal holes were recorded. The observations of May 8, 1995, are briefly described. It is found that in the He I 10830 spectroheliograms there exist dark structures on a scale of 10″- 20″whose absorption depths are 10% - 20%. On the velocity image deduced from two off-band He I 10830±0.14 Å images, blueshifts are remarkably seen in those dark points. They also notice that in some local regions, the He I 10830 absorption obviously decreases and the chromospheric networks are relatively unclear, indicating the regions are coronal holes.
Fan Zhongyu
Li Hui
You Jianqi
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