In this talk, I will discuss the cosmic ray solar diurnal anisotropy measurements using data recorded by the GRAPES-3 muon telescope over two 11-year solar cycles (2001 – 2021). The GRAPES-3 muon telescope records four billion muons every day, allowing us to probe a tiny variation in the cosmic ray flux caused by solar activity. In the first part of my talk, I will discuss the efficiency and pressure correction analysis of the muon data, followed by a discussion on the extraction of solar diurnal anisotropy parameters using Fourier techniques. The yearly and monthly averages of solar diurnal anisotropy amplitude have been strongly dependent on interplanetary magnetic fields measured by NASA satellites located at the first Lagrange point. The annual phase variation of the diurnal anisotropy suggests its dependence on the 22-year solar magnetic cycle than the 11-year sunspot cycle.
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