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Solar Physics

, Volume 122, Issue 2, pp 345–363 | Cite as

Time-evolution of cosmic-ray intensity modulation

  • J. Xanthakis
  • H. Mavromichalaki
  • B. Petropoulos
Article

Abstract

Application of analyzing time-series into trigonometric series allows the investigation of cosmic-ray intensity variations in a wide periodicity range from a few months to 10 or even more years. By this technique, the amplitude and the phase of all observed fluctuations can be given. For this purpose, cosmic-ray data of five ground-based neutron-monitor stations for the time interval 1964–1985 have been analyzed.

Two kinds of periodicities appeared in these data. The first one includes occurrences at periods greater than two years, as the ones of 10.41, 8.41, and 5.50 yr, which differ very little in amplitude from station to station but are similar in phase, and the second one includes periodicities smaller than two years (24, 12, 8, and 6 months) which are similar in all stations but appeared in variable time intervals.

The possible origin of each observed variation due to a contribution either of cosmic-ray interaction in the upper atmosphere or to the solar dynamics is discussed.

Keywords

Atmosphere Variable Time Intensity Variation Variable Time Interval Intensity Modulation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • J. Xanthakis
    • 1
  • H. Mavromichalaki
    • 2
  • B. Petropoulos
    • 2
  1. 1.Research Center for Astronomy and Applied MathematicsAcademy of AthensAthensGreece
  2. 2.Physics Department, Nuclear and Particle Physics SectionUniversity of AthensAthensGreece

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