Open AccessInvestigating the influence of geometry of the heliospheric neutral current sheet and solar activity on modulation of galactic cosmic rays with a method of main components
Author(s) -
P. Yu. Gololobov,
П. А. Кривошапкин,
G. F. Krymsky,
С. К. Герасимова
Publication year - 2020
Publication title -
solnečno-zemnaâ fizika
Language(s) - English
Resource type - Journals
ISSN - 2712-9640
DOI - 10.12737/szf-61202002
Subject(s) - cosmic ray , heliospheric current sheet , physics , heliosphere , interplanetary magnetic field , modulation (music) , astrophysics , magnetic field , current sheet , forbush decrease , astronomy , solar wind , computational physics , coronal mass ejection , magnetohydrodynamics , quantum mechanics , acoustics
The work studies the cumulative modulating effect of the geometry of the interplanetary magnetic field's neutral current sheet and solar activity on propagation of galactic cosmic rays in the heliosphere. The role of each factor on the modulation of cosmic rays is estimated using a method of main components. The application of the method to experimental data on solar activity, to the tilt angle of the neutral sheet, and cosmic ray intensity for a long period from 1980 to 2018 allows us to reveal the temporal dynamics of roles of these factors in the modulation. The modulation character is shown to strongly depend on the polarity of the Sun’s general magnetic field. Results of the study confirm the existing theoretical concepts of the heliospheric modulation of cosmic rays and reflect its peculiarities for almost four full cycles of solar activity.