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Record Details

Record 37 of 19284
The emission-line spectrum above the limb of a solar coronal hole - 1175-1940 A
Author and Affiliation:
Feldman, U.(Hulburt (E. O.) Center for Space Research, Washington, DC, United States)
Doschek, G. A.(Hulburt (E. O.) Center for Space Research, Washington, DC, United States)
Vanhoosier, M. E.(Hulburt (E. O.) Center for Space Research, Washington, DC, United States)
Purcell, J. D.(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C., United States)
Abstract: Emission-line spectra of a coronal hole that coincided with the north pole of the sun are discussed which were obtained with a slit spectrograph aboard Skylab at positions within and above the solar white-light limb in the wavelength range from 1175 to 1940 A. Relative line intensities, line profiles, and full widths at half-maximum are presented for selected chromospheric and transition-zone lines observed above the present polar coronal hole. Average mass motions in the transition zone are determined as a function of electron temperature from the widths of the optically thin lines by assuming ionization equilibrium. The line intensities and profiles are compared with corresponding results deduced from spectra obtained above a quiet solar region. The coronal-hole spectra are found to imply an angular dependence for the source function as well as a radial dependence such that the source function is the smallest at the south pole and increases with decreasing solar latitude.
Publication Date: Jul 01, 1976
Document ID:
19760056545
(Acquired Dec 01, 1995)
Accession Number: 76A39511
Subject Category: SOLAR PHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal Supplement Series; 31; July 197
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: Hulburt (E. O.) Center for Space Research; Washington, DC, United States
Description: 23p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: LINE SPECTRA; SOLAR CORONA; SOLAR LIMB; SOLAR SPECTRA; ULTRAVIOLET SPECTRA; SKYLAB PROGRAM; SPACEBORNE ASTRONOMY; SPECTROHELIOGRAPHS
Imprint And Other Notes: Astrophysical Journal Supplement Series, vol. 31, July 1976, p. 445-466. NASA-supported research.
Miscellaneous Notes: p. 445-466. NASA-supported research
Availability Source: Other Sources
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