Physics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...48...21w&link_type=abstract
Solar Physics, vol. 48, May 1976, p. 21-40.
Physics
32
Atmospheric Models, Far Ultraviolet Radiation, Luminous Intensity, Solar Limb, Stellar Spectrophotometry, Chromosphere, H Alpha Line, Line Spectra, Solar Corona, Spicules, Stellar Models, Transition Layers
Scientific paper
A comparison of limb brightening measurements with theoretical limb brightening curves calculated for simple atmospheric models indicates that a significant fraction of the EUV emission from lines formed in the transition layer comes from spicules. We find that spicules contribute about 20% of the total quiet sun intensity for lines of the C II, C III, N III, and O VI ions. The uncertainty in the magnitude of the percentage is about a factor of 2. The EUV-emission scale heights above the limb are consistent with the assumption that the variation with height of the number of EUV-emitting spicules is the same as for H-alpha-emitting spicules. Optical depths derived for the C II 1335 A and C III 977 A lines yield estimates for the pressure in the transition layer that are in good agreement with pressures derived under the assumption that the transition layer is in pressure equilibrium with the chromosphere and corona.
Mariska John T.
Withbroe George L.
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