Cosmic Research

, Volume 57, Issue 1, pp 14–17 | Cite as

Cosmic Rays During the Geomagnetic Disturbance in January 2015

  • M. V. KravtsovaEmail author
  • V. E. Sdobnov


According to the data of ground-based measurements of cosmic rays (CRs) from the world network of stations, the behavior of CR intensity during the geomagnetic disturbance in January 2015 has been studied using the spectrographic global survey method. The spectra of CR variations and spectrum indexes of these variations are presented, when approximating the spectrum by the power function of the particle rigidity in the rigidity range from 10 to 50 GV, as well as pitch-angular anisotropy of CRs. It is shown that the spectrum indexes of CR variations at its approximation by the power function of the particle rigidity in the phase of maximum modulation are greater than in the phases of decay and recovery of CR intensity.



The study was conducted as part of a state assignment for 2018, no. 007-00163-18-00 of January 12, 2018 using scientific equipment of the Angara Center for Collective Use and the Unique Scientific Facility, Russian National Ground Network of Cosmic-Ray Stations.


  1. 1.
    Forbush, S.E., On the effects in the cosmic-ray intensity observed during the recent magnetic storm, Phys. Rev., 1937, vol. 51, pp. 1108–1109.ADSCrossRefGoogle Scholar
  2. 2.
    Cid, C., Palacios, J., Saiz, E., and Guerrero, A., Redefining the boundaries of interplanetary coronal mass ejections from observations at the ecliptic plane, Astrophys. J., 2016, vol. 828, no. 11, pp. 1–9. CrossRefGoogle Scholar
  3. 3.
    Dvornikov, V.M. and Sdobnov, V.E., Analyzing the solar proton event of October 22, 1989 using the method of spectrographic global survey, Solar Phys., 1998, vol. 178, no. 2, pp. 405–422.Google Scholar
  4. 4.
    Tyasto, M.I., Danilova, O.A., Ptitsyna, N.G, and Sdobnov, V.E., Variations in cosmic ray cutoff rigidities during the great geomagnetic storm of November 2004, Adv. Space Res., 2013, vol. 51, pp. 1230–1237. https:// Scholar
  5. 5.
    Kravtsova, M.V. and Sdobnov, V.E., Analysis of Forbush decreases during strong geomagnetic disturbances in March–April 2001, Astron. Lett., 2014, vol. 40, no. 8, pp. 519–525.ADSCrossRefGoogle Scholar
  6. 6.
    Kravtsova, M.V. and Sdobnov, V.E., Cosmic rays during great geomagnetic storms in cycle 23 of solar activity, Geomagn. Aeron. (Engl. Transl.), 2016, vol. 56, no. 2, pp. 143–150.Google Scholar
  7. 7.
    Klyueva, A.I., Belov, A.V., and Eroshenko, E.A., Specific features of the rigidity spectrum of Forbush effects, Geomagn. Aeron. (Engl. Transl.), 2017, vol. 57, no. 2, pp. 177–189.Google Scholar
  8. 8.
    Kravtsova, M.V. and Sdobnov, V.E., Effects in cosmic rays in March 1991, Geomagn. Aeron. (Engl. Transl.), 2011, vol. 51, no. 7, pp. 958–962.Google Scholar
  9. 9.
    Kravtsova, M.V. and Sdobnov, V.E., Analyzing the June 2015 Forbush effect by the spectrographic global survey, Bull. Russ. Acad. Sci.: Phys., 2017, vol. 81, no. 2, pp. 177–179.CrossRefGoogle Scholar
  10. 10.
    Dvornikov, V.M., Kravtsova, M.V., and Sdobnov, V.E., Diagnostics of the electromagnetic characteristics of the interplanetary medium based on cosmic ray effects, Geomagn. Aeron. (Engl. Transl.), 2013, vol. 53, no. 4, pp. 430–440.Google Scholar
  11. 11.
    Dorman, L.I., Smirnov, V.S., and Tyasto, M.I., Kosmicheskie luchi v magnitnom pole Zemli (Cosmic Rays in the Earth’s Magnetic Field), Moscow: Nauka, 1971.Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Institute of Solar-Terrestrial Physics, Siberian Branch, Russian Academy of SciencesIrkutskRussia

Personalised recommendations