Earth Observation Satellite (EOS)-04 launched on 14^th February 2022, carries a C-band Synthetic Aperture Radar (SAR) for Agriculture, Forestry, Hydrology and Flood mapping applications. In this paper, we have used C-band SAR images and near-simultaneous observations from the Global Precipitation Measurements (GPM) to study the signatures of multiple convective rain cells. The bright patches are found on C-band SAR imagery, which depicts the information of hydrometeors such as graupels or hails in the melting layer. For the first time, unambiguously estimated the diameter of the convective core rain cells from the C-band SAR backscattered signal and compared near-simultaneous observations from GPM-GMI and Ku-band radar to confirm our findings. In future, we will decipher between convective and stratiform rain signatures on C-band SAR imagery and the possibility between C-band backscattered signals with lighting events. Thus, the present study demonstrates the potential of C-band SAR for the signatures of convective rain cells.