Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..280l&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Feb. 15, 1980, p. 280-284.
Astronomy and Astrophysics
Astronomy
10
Chromosphere, Line Spectra, Solar Spectra, Ultraviolet Astronomy, Optical Thickness, Oso-8, Radiative Transfer, Ultraviolet Spectrometers
Scientific paper
The University of Colorado ultraviolet spectrometer aboard the Orbiting Solar Observatory 8(OSO 8) has measured self-reversed profiles of the resonance line of C IV lamda 1548.2 at the limb passage of an active region. The degree of the self-reversal together with the absolute intensity of the line profile determine the electron density in the active region at 10 to the 10th/cu cm at temperatures where the C IV line is formed. The nonthermal component of the broadening velocity is no more than 14km/s, and the physical thickness of an equivalent plane-parallel slab in hydrostatic equilibrium that would give rise to the observed line profiles is about 430 km.
Hansen Esben Rune
Lites Bruce W.
Shine Richard A.
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