Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.232..315m&link_type=abstract
Astrophysics and Space Science, Volume 232, Issue 2, pp.315-326
Astronomy and Astrophysics
Astrophysics
Scientific paper
The dependence of cosmic-ray intensity on 21st solar cycle phenomena has been studied using monthly cosmic-ray values from nine world wide Neutron Monitoring Stations. For this purpose the long-term cosmic-ray modulation is modelled by treating the most appropriate source functions among various solar, interplanetary and terrestrial activity indices as the input and the cosmic-ray intensity as the output of a linear system taking into account the corresponding time-lag. In this way the modulated galactic cosmic-ray intensity has been reproduced to a certain degree as the cosmic-ray variations follow the observations with a standard deviation of ~ 10%. Still remaining short-term variations in all stations with periods of 2.7 and 3.7 months can possibly be related to the galactic origin of cosmic-rays. The Simpson solar wind model improved by the spherically symmetric diffusion-convection theory can describe our proposed method.
Marmatsouri E.
Mavromichalaki Helen
Vassilaki A.
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