|
|||||
|
|
Cosmic-ray intensity related to solar and terrestrial activity indices in solar cycle No. 20 |
|
| Authors: | J Xanthakis H Mavromichalaki B Petropoulos |
| Institution: | 1. Research Centre for Astronomy and Applied Mathematics, Academy of Athens, Greece 2. Nuclear Physics Laboratory, University of Athens, Greece 3. Research Centre for Astronomy and Applied Mathematics, Academy of Athens, Greece |
| Abstract: | The 11-year modulation of cosmic-ray intensity is studied using the data from nine world-wide neutron monitoring station over the period 1965–1975. From this analysis the following relation among the modulated cosmic-ray intensityI, the relative sunspot numberR, the number of proton eventsN p and the geomagnetic indexA p has been derived which describes the long-term modulation of cosmic rays $$I = C - 10^{ - 3} (KR + 4N_P + 12A_P ),$$ whereC is a constant which depends on the rigidity of each station, andK is a coefficient related to the diffusion coefficient of cosmic rays and its transition in space. The standard deviation between the observed and calculated values of cosmic-ray intensity is about 5–9%. This relation has been explained by a generalization of the Simpson solar wind model which has been proved by the spherically symmetric diffusion-convection theory. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |