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The coronal temperature and nonthermal motions in a coronal hole compared with other solar regions
Doschek, G. A.; Feldman, U.
AA(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.)
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 212, Mar. 15, 1977, p. L143-L146. NASA-supported research. (ApJL Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Far Ultraviolet Radiation, Plasma Temperature, Solar Corona, Solar Spectra, Emission Spectra, Flow Velocity, Forbidden Bands, Iron, Silicon, Solar Limb
Bibliographic Code:


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.

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