SGP/MFR10M/C1 - Noise in ch415, sensor degradation

This instrument experienced general degradation over a period of more than a year.  Please 
see D120229.3 (DQPR-2693) and D120229.4 (DQPR-2763) for more information.

The 415nm channel was noisy.  The noise wasn't extreme, so initially at least, the mentor 
would not expect much impact in using the 415 data.  However, toward the end of the 
period covered by this DQR, we start seeing a general degradation of this instrument.  On 
20110720, after a calibration, channel 615 is dead.  On 20111101 the open channel stops 
functioning.  

This instrument is calibrated every three months.  The past couple/few calibrations showed 
a steady decline in the sensitivity of 415.  The declining sensitivity should be 
generally accounted for by each new calibration, but as time moved one, one should become less 
and less confident in those (415) data.

In general, the mentor would suggest using 20110720 as a cut-off date for reliable data 
(all channels).  Caution is given for all channels as the instrument is failing, though the 
channels not specifically mentioned may be OK.

• 25 meter Upwelling Hemispheric Irradiance, Filter 1(up_hemisp_narrowband_filter1)

• 25 meter Upwelling Hemispheric Irradiance, Filter 1(up_hemisp_narrowband_filter1)

SGP/MFR10M/C1 - Channel 615 dead

This instrument experienced general degradation over a period of more than a year.  Please 
see D120229.2 (DQPR-2564) and D120229.4 (DQPR-2763) for more information.

On 20110719 channel 615 stopped functioning.

• 25 meter Upwelling Narrowband Hemispheric Irradiance, Filter 3(up_hemisp_narrowband_filter3)

• 25 meter Upwelling Narrowband Hemispheric Irradiance, Filter 3(up_hemisp_narrowband_filter3)

SGP/MFR10M/C1 - Broadband channel failure

This instrument experienced general degradation over a period of more than a year.  Please 
see D120229.2 (DQPR-2564) and D120229.3 (DQPR-2693) for more information.

The open, or broadband, channel died on 20111101.

• 25 meter Broadband Upwelling Hemispheric Irradiance(up_hemisp_broadband)

• 25 meter Broadband Upwelling Hemispheric Irradiance(up_hemisp_broadband)