Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212l.143d&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 212, Mar. 15, 1977, p. L143-L146. NASA-supported research.
Astronomy and Astrophysics
Astrophysics
42
Far Ultraviolet Radiation, Plasma Temperature, Solar Corona, Solar Spectra, Emission Spectra, Flow Velocity, Forbidden Bands, Iron, Silicon, Solar Limb
Scientific paper
The coronal lines Si VIII (1446 A), Fe X (1463 A), Fe XI (1467 A), and Fe XII (1242 A and 1349 A) were observed above the limb over a quiet region, a coronal hole, and two active regions. The lines emitted at temperatures greater than 1 million K; i.e., the iron lines, are not observed in the coronal-hole spectra, so the indication is that in the coronal hole most of the plasma is at a temperature of less than 1 million K. The emission measures and column densities of the lines are derived from available atomic cross-section data, and the results are discussed. The nonthermal velocities in the coronal hole and quiet region are about 20 km/s. The velocities in the active regions are substantially less.
Doschek George A.
Feldman Uri
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