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Forbush decreases in the cosmic radiation

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Abstract

The experimental observations of Forbush decreases in recent years are reviewed and related to different theoretical models which have been proposed. The observational data from both ground-based and spacecraft experiments were selected to illustrate the important characteristics of Forbush decreases. The form of the rigidity dependence of the cosmic-ray modulation during the decreases and effects of the geomagnetic field upon the magnitude of the decreases are discussed. Recent results to deduce the cosmic-ray flow patterns from the observed anisotropies during the decreases are presented. Other features such as differences in onset times, recovery times, precursory increases are discussed. In considering the theoretical models particular emphasis is placed upon the agreement of the predictions of the model with the experimental observations. A theoretical model is suggested which is not original but represents a synthesis of several models previously proposed. Future important measurements and analyses necessary to an understanding of Forbush decreases are outlined.

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Lockwood, J.A. Forbush decreases in the cosmic radiation. Space Sci Rev 12, 658–715 (1971). https://doi.org/10.1007/BF00173346

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Keywords

  • Radiation
  • Anisotropy
  • Theoretical Model
  • Flow Pattern
  • Experimental Observation