Muon flux measured at GRAPES-3 and its correlation with the temperature of upper atmosphere and the interplanetary magnetic field

	Galactic cosmic rays are deflected by the Sun’s magnetic field, leading to significant energydependent temporal and spatial variations in their intensity. The muons observed at GRAPES-3 arise from extensive air showers originating in the interactions of these cosmic rays with the upper atmosphere. A clear anti-correlation has been observed between the muon flux measured by GRAPES3 and the upper atmospheric temperature, as well as the solar magnetic field. This makes atmospheric muon flux a promising tool for monitoring both the upper atmosphere temperature and the interplanetary magnetic field in real time. We shall discuss the analysis of 15 years of GRAPES-3 data, and present the results obtained so far.