Rigidity spectrum of the long-period variations of the galactic cosmic ray intensity in different epochs of solar activity

24th European Cosmic Ray Symposium

Iskra, K.^1 ; Siluszyk, M.^1 ; Alania, M.^1,2

Institute of Mathematics and Physics, Siedlce University, Poland^1

Ivan Javakhishvili Tbilisi State University, Nodia Institute of Geophysics, Tbilisi, Georgia^2

关键词: Galactic cosmic rays;    Interplanetary magnetic fields;    Muon telescope;    Near earth orbit;    Neutron monitors;    Power spectral densities (PSD);    Resonance frequencies;    Solar wind velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/632/1/012079/pdf
DOI  :  10.1088/1742-6596/632/1/012079

来源: IOP

【 摘 要 】

We investigate character of correlations between the rigidity spectrum exponent γ of the 11-year variations of the Galactic Cosmic Ray (GCR) intensity and the exponent v of the Power Spectral Density (PSD) of the Interplanetary Magnetic Field (IMF) turbulence in period 1968-2012 using data of the IMF and carefully selected neutron monitors. We show that a clear inversely correlation between γ and v is observed when a resonance frequency range f1-f2of the IMF turbulence (using for calculation of v), are determined taking into account changes of the solar wind velocity Vswand strength B of the IMF versus solar activity. We assume that an essential contribution to the scattering of GCR particles in the heliosphere is setting up generally by the turbulence of Byand Bzcomponents of the IMF. Therefore, in this paper we use the exponents vyand vzof PSD of the Byand Bzcomponents of the IMF turbulence. Generally, both γ and v can be accepted as the essential proxies to study GCR propagation near earth orbit in heliosphere for the rigidity range of GCR particles to which neutron monitors and ground muon telescopes respond