Titre du document

The Oxford Solar Spectroscope

Lien vers le document
Nom du Corpus

AstroConcepts

Auteur(s)
  • H. H. Plaskett
Résumé

The prismatic spectroscope, used with the Oxford solar telescope, has a clear aperture of 15.2 cm and a focal length of 8.96 m. The linear dispersion varies from 2.8 mm A–1 at ? 4000 to 0.5 mm A–1 at ? 6500. The horizontal apparatus function, determined from the Kr line ? 4319.6, has a half-width of 0.048 A with a marked asymmetry to the red. The practical resolving power at this wave-length is 93 900, less than one-third of that predicted by diffraction theory. Because of the asymmetry in the apparatus function the centres of intensity of solar absorption lines are displaced to the red by amounts which vary as their equivalent widths; precautions must therefore be adopted in the measurement of Doppler displacements. The vertical apparatus function (up and down the slit) has a half-width of 0.167 mm. This tends to wash out the spectra of fine details on the solar surface, but theory and practical experience show that spectra of solar granules can be obtained. For unanalysed white light, incident on a slit with a height of 19 mm, the general scattered light in the focal plane is 1.6 per cent.

Langue(s) du document
Indéterminé
Année de publication
1952
Revue

Monthly Notices of the Royal Astronomical Society

Éditeur
OUP
Type de publication
journal
Type de document
research-article
Présence de XML structuré
Non
Version de PDF
1.4
Score de qualité du texte
4.317
Nom du concept
  • Solar granulation
Catégories Science-Metrix
  • 1 - natural sciences ; 2 - physics & astronomy ; 3 - astronomy & astrophysics
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences biologiques et medicales ; 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Space and Planetary Science
  • 1 - Physical Sciences ; 2 - Physics and Astronomy ; 3 - Astronomy and Astrophysics
Catégories WoS
  • 1 - science ; 2 - astronomy & astrophysics
Identifiant ISTEX
B098EF3093BD1357CD71E1F3CE00FC4C4CA50130
ark:/67375/HXZ-L9DGXVJ6-V
Powered by Lodex 9.4.5