Titre du document

Interstellar Hydrogen Densities in the Surroundings of the Solar System

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Nom du Corpus

AstroConcepts

Auteur(s)
  • H. J. FAHR
Affiliation(s)
  • Institut fr Astrophysik und Extraterrestrische Forschung der Universitt Bonn.
Résumé

IT is usually assumed that the solar system is embedded in a region of neutral interstellar hydrogen, that is, an HI region. Up to now it has not been possible to measure the density of this interstellar medium in the vicinity of the solar system. Radio astronomy methods can only measure the integrated number of hydrogen atoms within the active antenna cone of the measuring telescope, and therefore are unable to give the density of interstellar hydrogen in the local region of our galaxy. On the other hand, measurements of the background of Lyman- by spacecraft and satellites are difficult to interpret because the sources of this background radiation are not certain. If the Lyman- background has a galactic origin, or is due to scattering of the Lyman- radiation of the nearby stars by interstellar hydrogen, nothing can be deduced about the density of the interstellar hydrogen in the neighbourhood of the solar system. But there is a good chance of obtaining a density value for the surrounding interstellar medium if the measured Lyman- background can be ascribed to the scattering of the solar Lyman- radiation by the neutral hydrogen near the Sun.

Langue(s) du document
Indéterminé
Année de publication
1970
Revue

Nature

Éditeur
Nature
Type de publication
journal
Type de document
other
Présence de XML structuré
Oui
Version de PDF
1.4
Score de qualité du texte
4.325
Nom du concept
  • Heliosphere
Catégories Science-Metrix
  • 1 - general ; 2 - general science & technology ; 3 - general science & technology
Catégories Inist
  • 1 - sciences appliquees, technologies et medecines ; 2 - sciences exactes et technologie ; 3 - terre, ocean, espace ; 4 - astronomie
Catégories Scopus
  • 1 - General ; 2 - Multidisciplinary ; 3 - Multidisciplinary
Catégories WoS
  • 1 - science ; 2 - multidisciplinary sciences
Identifiant ISTEX
B43B603C345F5FAD92AFDF0339883FCF0E13E0E7
ark:/67375/GT4-PZD6STTD-5
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