See this link:

https://www.intechopen.com/books/satellite-information-classification-and-interpretation/validation-of-satellite-tmpa-and-imerg-rainfall-products-with-the-imd-gridded-data-sets-over-monsoon

Sm Hasan

Please follow this article might help you, to download and analyze the data of TRMM and other with format Netcdf4

Good luck

Mohammed

Check this: https://www.sciencedirect.com/science/article/abs/pii/S0341816220300588#:~:text=RainfallErosivityFactor%20is%20an%20R%20package,prediction%20due%20to%20water%20erosion.&text=Erosive%20rainfall%20events%20are%20then%20used%20to%20compute%20rainfall%20erosivity%20values.