Titre du document

Solar activity and transient decreases in cosmic?ray intensity

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Nom du Corpus

AstroConcepts

Auteur(s)
  • D. Venkatesan
Résumé

The world?wide character of the intensity changes in meson and nucleon components is shown by a study of data from Ottawa, Churchill, and Resolute during the period October 1956 to December 1957. Further discussion is essentially restricted to the mean nucleonic component derived from the three stations. The investigation reveals an association between transient decreases in cosmic?ray intensity and the central meridian passage of active solar regions. On an average, the greater the activity rating of the regions, the larger is the cosmic?ray decrease. It is not possible, however, to discuss the relation specifically in terms of the characteristics of the regions, such as flares, sunspots, and the like. Further support for the relation comes from observation of geomagnetic data. Attention is drawn to the similarity between small as well as large transient decreases in intensity with regard to presence or absence of recurrence tendency. The study supports the view that both the 27?day variation and the Forbush events differ only in degree and could therefore be attributed to the same mechanism. It is possible to attribute the cosmic?ray decreases to beams of ionized rarified gas emitted from the sun and differing considerably in their characteristics.

Langue(s) du document
Anglais
Année de publication
1959
Revue

Journal of Geophysical Research

Éditeur
Wiley
Type de publication
journal
Type de document
article
Présence de XML structuré
Non
Version de PDF
1.2
Score de qualité du texte
9.142
Nom du concept
  • Forbush decrease
Catégories Science-Metrix
  • 1 - natural sciences ; 2 - earth & environmental sciences ; 3 - meteorology & atmospheric sciences
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Palaeontology
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Space and Planetary Science
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Earth and Planetary Sciences (miscellaneous)
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Atmospheric Science
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Earth-Surface Processes
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Geochemistry and Petrology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Soil Science
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Water Science and Technology
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Ecology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Forestry
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Oceanography
  • 1 - Physical Sciences ; 2 - Earth and Planetary Sciences ; 3 - Geophysics
Catégories WoS
  • 1 - science ; 2 - geosciences, multidisciplinary
Identifiant ISTEX
A3B61C0C30BCE03E1FA66FAAF5FEE400B72C261A
ark:/67375/WNG-96LS9048-L
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