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The GPM Combined product only seems to go back to the start of GPM - where is the TRMM-era data?

The same algorithm is applied to both eras of data, with adjustments for the individual instruments’ characteristics, but it is split into two datasets with different names that represent the two eras.

At the NASA Precipitation Processing System (PPS) the retrospective datasets are accessible with filenames that start with 2B.GPM.DPRGMI for GPM files and 2B.TRMM.PRTMI for TRMM files via:
HTTPS:   https://arthurhouhttps.pps.eosdis.nasa.gov/gpmdata/

GPM Celebrates Ten Years of Observing Precipitation for Science and Society

Submitted by LisaN on
Publication Year
Authors
Andrea Portier, S. Ringerud, and G. J. Huffman
Journal
The Earth Observer
Publication URL
https://science.nasa.gov/science-research/earth-science/gpm-celebrates-ten-years-of-observing-precipitation-for-science-and-society/
Mission Affiliation
GPM
Major Category
GPM

Performance comparison of GPM IMERG V07 with its predecessor V06 and its application in extreme precipitation clustering over Türkiye

Submitted by LisaN on
Publication Year
Authors
Hakan Aksu and Sait Genar Yaldiz
Journal
Atmospheric Research
Volume
315
Page Numbers
107840
DOI
10.1016/j.atmosres.2024.107840
Mission Affiliation
GPM
Major Category
GPM

IMPORTANT: PPS's "arthurhou" GPM Production Data Archive Temporarily Unavailable

On Friday January 31, 2025, PPS detected hardware issues with PPS's Production data archive "arthurhou". Because of reported file length discrepancies, PPS is suspending access to the the 'arthurhou' production data server until they can analyze and fully resolve these issues as soon as possible. All data archiving to 'arthurhou' will be turned off during this unscheduled maintenance period. GPM production data and PPS access systems such as STORM will NOT be available for processing during that time. Please be aware that GPM NRT data file access on 'jsimpson' remains unaffected during this
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