12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[SH137] The secular variations of CR cutoff rigidities, caused by century variations in geomagnetic field, and CR variations.

Speakers

  • L. I. DORMAN

Primary authors

  • L. I. DORMAN (Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation RAN of N.V. Pushkov (IZMIRAN), Russia)

Co-authors

  • S.P. KARIMOV (Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation RAN of N.V. Pushkov (IZMIRAN), Russia)
  • E.A. EROSHENKO (Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation RAN of N.V. Pushkov (IZMIRAN), Russia)
  • R.T. GUSHCHINA (Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation RAN of N.V. Pushkov (IZMIRAN), Russia)
  • A.V. BELOV (Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation RAN of N.V. Pushkov (IZMIRAN), Russia)
  • V.G. YANKE (Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation RAN of N.V. Pushkov (IZMIRAN), Russia)

Description

The secular variations of the geomagnetic field lead to changes in the rigidity of the geomagnetic cutoff, which in turn leads to secular variations of cosmic rays. The expected effect reaches several percent, which must be taken into account when evaluating the spectrum of long-period variations. In this work, for all detectors of the world network, calculations of the expected secular variations of cosmic rays for the entire period of their monitoring from 1950 to 2020 were performed. For a rigorous evaluation of the distortions of the spectrum of cosmic-ray variations, a system of spectrographic equations was solved with respect to the parameters of the spectrum of cosmic-ray variations, taking into account the real variation in the rigidity of the geomagnetic cutoff during this period.