6319 ISSN 2286-4822 www.euacademic.org EUROPEAN ACADEMIC RESEARCH Vol. IX, Issue 10/ January 2022 Impact Factor: 3.4546 (UIF) DRJI Value: 5.9 (B+) Variations of Cosmic Ray Intensity to Sunspot Number during Solar Activity Cycle 24 ACHYUT PANDEY Professor and Head, Department of Physics Govt. TRS College, Rewa, M.P., India RANI GHURATIA ARVIND DHURVE Research Scholar, APS University, Rewa, M.P., India Abstract To explore the periodic behavior and relationship of sunspot numbers with cosmic ray intensity, we present the analysis from monthly data generated from December 2008 to December 2019 i.e. Solar Cycle 24. Cosmic ray intensity data used in this study are pressure corrected taken from Oulu neutron monitor with one month auto resolution. Sunspot number was obtained from Sunspot Index and Long-term Solar Observations. The cosmic ray intensity indicates that it undergoes the 11-year modulation that mainly depends on the solar activity in the heliosphere. Cosmic ray intensity corrected for frequency and pressure average over solar cycle 24 was 6475.58 counts/min. Statistical analysis confirmed that the cosmic ray intensity correlates negatively with the sunspot numbers, exhibiting an asynchronous phase relationship with a strong negative correlation with correlation coefficient -0.86. Keywords: Cosmic ray intensity, Sunspot number, Solar activity cycle, Galactic cosmic rays. 1. INTRODUCTION It is accepted that solar activities are closely related to solar magnetic field processes and therefore the study of the long-term evolution of solar activities are helpful for the understanding of the solar atmosphere and the dynamo theories [1–4]. Being the foremost vital index of the solar activities is sunspot numbers (SSN) that are wide studied alongside alternate indices [5–13]. Cosmic rays are highly energetic particles striking at the earth from the outer space. They can be originated from: heliospheric and galactic cosmic rays (GCR). The solar wind is electrically charged, and the energized particles can