OceanSat-2 image courtesy ISRO
The PO.DAAC regrets to inform its users of the discontinuation of data retrieval for its OSCAT Level 2B dataset produced by the QuikSCAT science data systems team at JPL.
The OSCAT scatterometer onboard the Oceansat-2 spacecraft experienced failure in its traveling wave tube amplifier (TWTA) toward the end of February 2014. As a result, science data processing of ocean surface wind vector data has permanently ceased. The last available file from the QuikSCAT science data systems team provided to the PO.DAAC is effective for 20 February 2014 corresponding to orbital revolution 23370 ending at 2330 UTC. The data retrieved over the course of the mission will remain available at the PO.DAAC for continued public distribution.
The Indian Space Research Organisation (ISRO) was responsible for the design, launch and operation of the OSCAT instrument and the Oceansat-2 spacecraft. This announcement comes just before the completion of OSCAT’s five year anniversary.
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Since one of the purposes of the proposed scatterometer on the International Space Station, the ISS-RapidScat, was to calibrate OSCAT, this failure may place the ISS mission in jeopardy. But note that five years is a good run for a space instrument. This leaves the wind measurements from the European METOP-A and METOP-B scatterometers, and passive measurements from the Coriolis WindSat instrument as the source of global wind measurements