Other
Scientific paper
Feb 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.170..429j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 170, Feb. 1975, p. 429-440.
Other
104
Far Ultraviolet Radiation, Helium Ions, Line Spectra, Solar Spectra, Spectral Line Width, Ultraviolet Spectra, Atomic Energy Levels, Atomic Spectra, Electron Energy, Emission Spectra, Helium Atoms, Luminous Intensity, Mathematical Models, Optical Thickness, Temperature Effects
Scientific paper
The present paper points out that the lines of neutral and singly ionized helium in the solar EUV spectrum have anomalously high intensities when compared with lines of other ions formed at similar temperatures. It is suggested that the observed absolute and relative intensities, and, in addition, the line widths, can be accounted for if a mechanism which causes the helium atoms and ions to be excited by electrons with temperatures greater than the ionization equilibrium value is operating. Further, the observed decrease of helium line intensities in coronal holes, while other transition-region lines decrease little if at all, can be accounted for by the reduction of the enhancement mechanism in coronal holes and/or by the reduced temperature gradient in these regions. An essential factor that makes the helium lines so sensitive to the presence of such a mechanism is the large value of the ratio of the excitation potential of the lines to the electron temperature.
No associations
LandOfFree
The intensities of helium lines in the solar EUV spectrum 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 intensities of helium lines in the solar EUV spectrum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The intensities of helium lines in the solar EUV spectrum will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-999919