The emission-line spectrum above the limb of a solar coronal hole: 1175--1940 A

Journal Article · Thu Jul 01 04:00:00 EDT 1976 · Astrophys. J., Suppl. Ser.; (United States)

DOI:https://doi.org/10.1086/190387· OSTI ID:7175652

Feldman, U; Doschek, G A; VanHoosier, M E; Purcell, J D

Spectra of a coronal hole obtained at positions within and above the solar white-light limb in the wavelength range from 1175 to 1940 A are discussed. The coronal hole coincided with the north pole of the Sun. The spectra were obtained by the NRL slit spectrograph (SO82-B) on Skylab. The spectral resolution is 0.06 A and the projected slit area on the Sun was 2'' x 60'' (1450 x 43500 km). Relative line intensities and line profiles are presented for coronal-hole lines formed in the temperature region of the solar atmosphere from approx.8 x 10/sup 3/ K to 2.2 x 10/sup 5/ K. The coronal-hole line intensities are compared with corresponding intensities obtained from recently pulished quiet-Sun spectra. Line profiles of both optically thick lines are shown as a function of height above the limb. Random mass-motion velocities are deduced from the optically thin coronal-hole lines, and are compared with corresponding results deduced from quiet-Sun spectra. (AIP)

• Research Organization: E. O. Hulburt Center for Space Research Naval Research Laboratory
• OSTI ID: 7175652
• Journal Information: Astrophys. J., Suppl. Ser.; (United States), Journal Name: Astrophys. J., Suppl. Ser.; (United States) Vol. 31:3; ISSN APJSA
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHEMICAL COMPOSITION
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
FUNCTIONS
LINE WIDTHS
OPACITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
SOLAR CORONA
SPECTRA
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
STARS
SUN
ULTRAVIOLET RADIATION