Solar Physics

, Volume 125, Issue 2, pp 409–414

Simulation of long-term cosmic-ray intensity variation

  • H. Mavromichalaki
  • E. Marmatsouri
  • A. Vassilaki
Article

Abstract

Selecting the most appropriate source functions among the various solar, interplanetary and terrestrial activity indices we have attempted to reproduce to a certain degree the long-term modulation of galactic cosmic-rays. For this study monthly cosmic-ray data from nine world-wide neutron monitor stations for the period 1975–1985 have been analysed. The empirical formula which has been used to compute the long-term cosmic-ray variations follows the observations fairly well.

It is noteworthy that the residuals in the cosmic-ray intensity between that observed and that calculated by this empirical formula exhibits a still remaining short-term variation in all stations of 2.7 and 3.7 months. Possible interpretations of these observed periodicities related to galactic origin are given.

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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • H. Mavromichalaki
    • 1
  • E. Marmatsouri
    • 1
  • A. Vassilaki
    • 1
  1. 1.Physics Department Nuclear and Particle Physics SectionUniversity of AthensAthensGreece

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