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TRMM PR standard product release after recovery from anomaly
TRMM/PR suffered a lose of its original (A-side) electronics
interface. Fortunately JAXA/NICT had designed and built the TRMM
PR with redundancy (B-side). On May 29, the A-side began to be a
problem and the process of switching to the B-side electronics
was begun. This changeover including investigation took about 2
NASA/PPS have been operating PR with the B-side since June 17.
B-side electronics have slightly different characteristics than
the A-side and JAXA has been carefully investigating the best
way to calibrate the PR so as to maintain continuity with the
A-side driven measurements. This has required not only internal
calibration information but also several external calibrations.
It has also required looking at a longer period of data using
B-side to ensure it is fully understood. These re-calibration of
B-side took about 5 months.
On December 18, JAXA and PPS are pleased to inform you the PR
B-side all standard products release from June 19.
Please also be aware of the following issue for TRMM PR Level 3
products after TRMM PR switched to the B-side:
The PR anomaly has caused the loss of PR data from 29 May 2009
to 19 June 2009. As a result, the June 2009 Level 3 PR
products contain only 12 days of data. This makes the June 2009
products less reliable due to the lack of sufficient data upon
which to base the statistics. Please take care when using the
June 2009 product for quantitative analysis.