Study of solar activities for long term modulation of cosmic rays for the period of Solar Cycle 23 and ascending Phase of solar cycle 24

Abstract

We have been able to analyse solar activity (SA) development phase in cycle 24, which included variations in cosmic ray (CR) intensity over long time periods, the era of regular granulations beginning in 1951, and the very deep SA minimum between cycles 23 and 24 in the past few years, were all part of this cycle. In cycles 19–23, low ticles were measured with neutron monitors on spacecraft and in the stratosphere, and the CR density during the aforementioned period (2009) was higher than at prior CR maxima. During an exceptionally long SA minimum, the intensity maximum—whose value depends on particle energy—was observed in CR variations. When comparing the SA growth stages of the three years (2010–2012) after 2009 to previous cycles, there was a significant decrease in CR modulation. This anomaly in CR fluctuations was investigated by looking at the likely explanations, which include changes in SA features during this time and a minimum value for the CR residual modulation between cycles 23 and 24. Various solar magnetic field indices and properties, accounting for intermittent solar activity, have their contributions estimated.