ALOS has been on orbit for two years and a half after its launch on January 24 2006. After its initial calibration for the
first six months, ALOS was thrown into the operational phase after Oct. 23 2006. In operation phase, PALSAR has
been activated based on the basic mission operation plan that summarizes the requests for imaging from JAXA
calibration team, the power users, Principal Investigator (PIs) of the ALOS Research announcement, and the Kyoto and
Carbon initiatives for monitoring the forest deforestation and degradation. By now, ALOS collected the PALSAR data
more than 700,000 scenes, which correspond to 8 times global, land coverage. The calibration results using the one year
data set shows that PALSAR has an excellent performance of the radiometric accuracy of 0.6 dB using all the corner
reflectors associated with the calibration experiments and 0.17 dB using the Swedish 5m sized corner reflectors, the
geometric accuracy with 9.3 m (RSS). The polarimetric performance is that the amplitude variation of the VV/HH
channels is 0.3 dB and phase is 0.3 degrees. In this paper, we will introduce the stability of the PALSAR calibration
results for after operation phase. This covers the stability of the sensor its self and the update of the antenna pattern
measurements, SCANSAR processing update, and the suppression of the ground radar interference. We also introduce
the generation of the 50 meter spaced ortho-rectified PALSAR mosaic datasets for the Kyoto and Carbon Initiatives.
Using the corner reflectors, we have monitored the temporal variation of the accuracies. We have also conducted the
antenna pattern variation and the stabilities using the Amazon rain forest data.