Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...52..211g&link_type=abstract
Solar Physics, vol. 52, Apr. 1977, p. 211-228.
Astronomy and Astrophysics
Astronomy
22
Absorption Spectra, Chromosphere, Infrared Astronomy, Solar Granulation, Solar Spectra, Calcium, Helium, Hydrogen, Infrared Spectra, Line Spectra, Solar Limb
Scientific paper
A study of the solar spectrum near helium 10830 A has shown that where the line is very weak, the anomalous ratio of the two components is due almost certainly to faint blends. The center-limb intensity variation over supergranule centers is in good agreement with an optically thin law. The line is stronger over supergranule boundaries, and the ratio of the two components can be understood only if the absorbing elements have been resolved incompletely (as is probable); center-limb intensity variations could not be used to distinguish between unresolved horizontal platelets or inclined slabs. The integrated absorption in 10830 A over supergranule centers is double that at the boundaries. An analysis of the extension of 10830 A beyond the limb has failed to reveal the relative contributions from these two regions or their variations with height (though the supergranule-center emission should be located relatively low). Line profiles in 10830 A, hydrogen Pa-gamma and Ca II 8542 A indicate that out to at least 5000 km, line broadening is effectively nonthermal, with horizontal rms velocities of about 20 km/s.
Giovanelli R. G.
Hall Donavan
No associations
LandOfFree
The helium 10830 A line in the undisturbed chromosphere does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The helium 10830 A line in the undisturbed chromosphere, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The helium 10830 A line in the undisturbed chromosphere will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1619216