Browsing by Subject "Solar cycle"
Now showing items 1-6 of 6
-
Fourth harmonic behaviour of the 27-day periodicity in galactic cosmic rays during different solar magnetic polarity intervals
(Springer, 2020)Galactic cosmic rays as observed by the Hermanus and Jungfraujoch Neutron Monitors between 1960 and 2018 have been analysed using various spectral analysis techniques. Daily mean neutron monitor measurements are used to ... -
A fully time-dependent ab initio cosmic-ray modulation model applied to historical cosmic-ray modulation
(IOP Publishing, 2020)Cosmogenic nuclide records can in principle allow for the estimation of the behavior of the heliospheric magnetic field (HMF) in the distant past. This requires careful modeling of cosmic-ray transport in a manner that is ... -
Hydrogen Lyman-Alpha Periodicity Behaviour During Various Solar Cycles
(Springer, 2023)The temporal behaviour of various periodicities of hydrogen Lyman-alpha (Ly-α) between 1950 and 2020 have been anal ysed using Lomb-Scargle and Morlet wavelets spectral analysis techniques. Daily mean values of Ly-α radiance ... -
Modeling ground and space based cosmic ray observations
(Elsevier, 2012)After entering our local astrosphere (called the heliosphere), galactic cosmic rays, as charged particles, are affected by the Sun’s turbulent magnetic field. This causes their intensities to decrease towards the inner ... -
The modulation of galactic cosmic rays over a solar cycle
(North-West University (South Africa), 2016)This work studied the modulation of galactic cosmic rays in the heliosphere by using a well-established, time dependent numerical modulation model to calculate cosmic ray transport inside the heliosphere over a solar ... -
Time–dependent modulation of cosmic rays in the outer heliosphere
(North-West University, 2013)The time-dependent modulation of galactic cosmic rays in the heliosphere is studied by computing intensities using a two-dimensional, time-dependent modulation model. The compound approach of Ferreira and Potgieter (2004), ...