Solar Modulation on Galactic Cosmic Rays in the Earth’s Atmosphere

A brief review of solar modulation on galactic cosmic rays in the earth’s atmosphere is presented. The results of the characterizations of the major two events i.e. Galactic Cosmic Rays (GCRs)(measured in counts) and Galactic Solar rays(GSRs) (measured in counts) against time (measured in hour) shows significant variations. It was also observed that the variations of the events are slightly out of phase. The anti-correlation coefficient, r between GCRs and GSRs, ranging from -0.015 to -0.470, shows that the events originates from different sources. The low level of r in this result indicates that other solar activities such as sunspot, coronal mass ejection and solar wind directly enters the Earth’s atmosphere.