Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...224..671c&link_type=abstract
Astrophysical Journal, Part 1, vol. 224, Sept. 1, 1978, p. 671-676.
Astronomy and Astrophysics
Astrophysics
14
Chromosphere, Oso-8, Satellite Observation, Solar Corona, Solar Spectra, Wave Propagation, Line Spectra, P Waves, Phase Shift, Propagation Velocity, Ultraviolet Spectrometers
Scientific paper
The University of Colorado instrument on OSO 8 has been used to observe relative phases of the 300-s intensity variation between the temperature-minimum region and several emission lines formed in the solar chromosphere and chromosphere-corona transition region. The lines used are due to Fe II, Si II, C II, Si IV, and C IV. The scattered light in the spectrograph, which originates almost entirely in the spectral region between 1700 and 1900 A, was used as a probe of the temperature-minimum region. The lines of Fe II, Si II, and C II show almost identical delays of approximately 30 s relative to the temperature minimum, while the intensity oscillations of the lines of Si IV and C IV appear to lead the temperature-minimum intensity oscillations by about 10 s.
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