Open AccessDistribution of tensor anisotropy of cosmic rays near the neutral current sheet
Author(s) -
P. Yu. Gololobov,
P. Yu. Gololobov,
П. А. Кривошапкин,
П. А. Кривошапкин,
Г. Ф. Крымский,
G. F. Krymsky,
В. Г. Григорьев,
Vladislav Grigoryev,
С. К. Герасимова,
С. К. Герасимова
Publication year - 2017
Publication title -
solnečno-zemnaâ fizika
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.11
H-Index - 2
ISSN - 2412-4737
DOI - 10.12737/22603
Subject(s) - physics , interplanetary magnetic field , isotropy , astrophysics , anisotropy , cosmic ray , computational physics , heliospheric current sheet , magnetic field , harmonics , earth's magnetic field , forbush decrease , current sheet , geophysics , solar wind , magnetohydrodynamics , coronal mass ejection , optics , quantum mechanics , voltage
We analyze time profiles of isotropic intensity, components of vector and tensor anisotropies of cos-mic rays (CR) when Earth crosses the neutral sheet of the interplanetary magnetic field (IMF) in solar activity cycles 23–24. The moments of the crossings are de-termined from Wilcox Observatory synoptic charts and IMF data. Periods of Forbush decreases and ground level enhancements are excluded from the analysis. The events are analyzed for the epochs of positive and negative signs of the Sun’s general magnetic field. During each epoch, the crossings from the positive sector to the negative one and vice versa are separated. In total, 213 crossing events have been selected. The first two spherical harmonics of the angular CR-distribution are obtained using the global survey method. In each case, the average number of stations is equal to 32. The analysis shows that the temporal change of the isotropic component is caused by a magnetic mirror. For the first time, the zonal harmonics are reliably distinguished, and the existence of the antisymmetric diurnal CR-variation in a low energy range, which is oriented along IMF, is recognized. We compare our results with those obtained earlier.