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Geomagnetism and Aeronomy

, Volume 49, Issue 1, pp 1–13 | Cite as

Variations in the cosmic ray fluxes, modulated by the solar and terrestrial magnetic fields, and climate changes. Part 3: A time interval of 1.5 Myr, including the pleistocene

  • V. A. DergachevEmail author
  • P. B. Dmitriev
  • O. M. Raspopov
  • H. Jungner
Article

Abstract

The most reliable data on a change in the intensity of cosmic rays and geomagnetic field on large time scales have been analyzed, and the relations between changes in these processes and climate during the last 1.5 Myr have been studied. An analysis indicated that the climate of the Earth is affected by changes in the Earth’s orbit parameters and geomagnetic dipole values; however, the climate responds to these changes with a delay of 10 kyr and immediately, respectively. In this case about two thirds of the effect of eccentricity on 18O is implemented via an intermediate chain: virtual axial dipole moment, changes in which can be related to changes in eccentricity. Thus, an analysis of the accumulated data on the processes, proceeding in the Earth’s atmosphere during the interaction with cosmic rays on the scales of several years to several hundreds of thousand years, indicates that the cosmophysical factor of influence on climate cannot be rejected. To make the conclusion more convincing, it is necessary to collect data for the studied time interval in a much wider region, to more accurately date samples, and to study the response of the climatic system to the external influence.

PACS numbers

94.20.wq 

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Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • V. A. Dergachev
    • 1
    Email author
  • P. B. Dmitriev
    • 1
  • O. M. Raspopov
    • 2
  • H. Jungner
    • 3
  1. 1.Ioffe Physicotechnical InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, St. Petersburg BranchRussian Academy of SciencesSt. PetersburgRussia
  3. 3.University of HelsinkiHelsinkiFinland

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