STAR Integrated Calibration/Validation System website

GOES ABI Calibration Events Log

This is a collection of events that, at the discretion of the GOES-R Calibration Working Group (CWG), have known or potential impact on L1b data quality. It is maintained by the CWG throughout the instrument mission life for ABI L1b users, producers, calibration specialists, managers, vendors, international partners, and members of the public interested in ABI calibration. For other ABI related events, please check the link below:

https://www.ospo.noaa.gov/Operations/messages.html

(Click column headings to sort; Type in the "Search" box to query table contents.)

Updated: 11/11/2019

Event StartDate EndDate Notes
B16 LUT update 05/10/2019 05/10/2019 The lunar rejection threshold of Band 16 was updated to reduce the potential striping caused by detector noise.
Navigation parameters update 6/1/2017 6/15/2017 RDP values are updated
Intermittent Channel 8 striping 12/31/2018 01/31/2019 repeated striping due to anomalous performance of det #208 and #107. Corrected with the BDS update of det #208 and manual space look reset of #107
ABI Band02 is ~7% brighter than VIIRS 6/1/2017 G16 ABI Band2 (0.64um) is brighter than VIIR I1band by ~6-8%, depending on time.
B05 Striping associated with Detector #200/#201 6/1/2017 Persist striping patterns are detected associated with bad performance from Dectector #200/#201
B10 D312 Striping and BDS Update 6/1/2017 10/3/2017 Striping was caused by B10 Detector #312 and was removed with the BDS update on 10/03/2017
B12 D257 Striping and BDS Update 6/1/2017 10/3/2017 Striping was caused by B12 Detector #257 and was removed with the BDS update on 10/03/2017
Cold pixels around file 6/1/2017 For the 3.9um channel (B07, and for this band only), some pixels around (usually not immediately next to) extremely hot targets such as fire have substatially cold bias. The affected pixels are properly flagged. The root cause is reasonably well understood. Correction is being discussed.
Major navigation upgrade 6/1/2017 Upgrade elements: (i) static FPA shifts are absorbed into the LUTs; (ii) GNC gyro rate capping is adjusted. Upgrade effects: (i) navigation disturbances from the Kalman filter reset are reduced several times; (ii) navigation stability is increased.
Periodic IR Calibration Anomaly (PICA) 6/1/2017 10/19/2017 PICA was a periodic radiometric calibration anomaly with 15 minutes of periodicity observed at GOES-16 ABI Mode-3 MESO and CONUS images caused by the residual of incident angle-dependent scan mirror emissivity corrections. It was corrected with the update of scan-mirror emissivity LUTs on 10/19/2017.
Sub-optimal solar calibration for VNIR Channels 01/15/2017 12/12/2017 Until 12 December 2017, solar calibration was often executed at suboptimal time of the day, leading to 0-2%(?) bias of radiance(?, channel dependent).
ICT Temperature Bias 6/1/2017 6/19/2018 The ICT PRT coefficients that converted the PRT raw counts into temperatures were inconsistent with the values from the correct vendor source. This discrepancy led to a -0.2 K bias to the calculated ICT temperatures and colder bias of similar magnitude of the L1b products for all the IR channels. On 19 June 2018, the revised LUT was implemented in GS data processing and resulted in improved radiometric calibration accuracy.
GOES-16 Drifted from 89.5W to 89.2W 8/8/2017 9/3/2017 GOES-16 drifted from 89.5W to 89.2W for the purpose of testing potential impacts related to shifting GOES-16 operational station keeping position from 75.0W to 85.2W.
Transient navigation anomalies 9/28/2017 Anomalies involve large and sudden East-West and/or North-South navigation swings exceeding MRD limits. The reason identified as an intermittent loss of the gyro rate information in the Ground processing. The fix extrapolates observed gyro rate onto the period of absence.
B05 Striping caused by incorrect of use of Look-up table 11/19/2017 12/29/2017 In-correct solar calibration LUT (pre-launch solar calibration coefficient) was used, resulting stronger striping at B05 during this period
Major navigation upgrade 11/20/2017 11/22/2017 Upgrade elements: (i) RDP correction for rotation and stretch; (ii) diagonal scan is implemented for 064 star detection; (iii) dynamic LMC is implemented; (iv) Kalman filter retuned. Upgrade effects: significant reduction of all MRD-specified navigation errors to well-below the specs. Deficiency: Kalman filter-induced instability remains in the navigation of thermal channels, though the magnitude is significantly reduced.
GOES-16 Drifted from 89.3W to 75.2W 11/29/2017 12/18/2017 GOES-16 station keeping relocated from the 89.3W Test location to its 75.2W operational location,and intruments re-evaluted for operational readiness.
B05 10% jump 12/12/2017 12/29/2017 In-correct B05 solar calibration coefficient was used during this period
GOES-16 ABI L1B data operational 12/18/2017 GOES-16 ABI Declared Operational
B12 D290/291 Striping and BDS update 12/30/2017 1/2/2018 Stripings have been detected for B12 D290 & D291 and the corresponding stripes were removed with the BDS update on 01/02/2018
VNIR Operational Algorithm Update 1/17/2018 2/7/2018 A new calibration algorithm was operationally implemented to reduce the VNIR striping observed since in-orbit. This implementation was accomplished with two steps: the first step was the upload of the new detector non-linearity (Q) LUT for B01/B02/B03 on 01/17/2018 and the second step was to implement the new algorith using Q-scaling on 02/07/2018. This new algorithm resulted in significant reduce in striping at B01/B02/B03 and slight change in the VNIR radiometric calibration accuracy. No change in B05 striping.
Sub-optimal solar calibration for VNIR channels 2/14/2018 2/20/2018 The three extra solar calirbation events were conducted to simulate the similar illumination condition for the solar calibration event conducted at about one year ago
B12 D309 Striping and BDS update 2/26/2018 3/5/2018 Striping was caused by B12 Detector #309 and was removed with the BDS update on 03/05/2018
Solar Intrusion 3/2/2018 Strong stray light appearing mostly in the Southern hemisphere. Two possible reasons: (i) Earth exclusion zone was not updated for the actual GOES-EAST position at -75.2 degrees; (ii) atmospheric refraction was not taken into account in the calculations of the Earth exclusion zone
Super Caterpillar Tracks 3/26/2018 3/26/2018 SCT correlates with the scan angle deviations, encoder spike flags, and enhanced high-energy electron flux in SEISS.
Sub-optimal solar calibration for VNIR channels 3/27/2018 3/27/2018 This extra solar calibration was conducted to simulate the similar illumination condition for the solar calibration event at about one year ago
VNIR 10% jumps 4/10/2018 4/10/2018 All 6 VNIR channels experienced ~10% jumps in the radioemtric calirbation accuracy due to the incorrect use of solar calibration coefficients
Sub-optimal solar calibration for VNIR channels 4/24/2018 4/24/2018 This extra solar calibration was conducted to simulate the similar illumination condition for the solar calibration event at about one year ago
Earth Orientation Parameter Predictions (EOPP) Correction 4/27/2018 Time format mismatch between GPS and ABI is identified and removed. In the past, that led to a small navigation bias for all channels. It was temporarily compensated since June 2018 by a constant correction. However, the bias is time dependent, so only now it is permanently fixed.
Channel 8 striping 4/29/2018 4/29/2018 Channel 8 striping was discovered. Caused by detector response level shifts (observed by both SPL and ICT data) with Detector #286 (Indexing from zero). It was discovered that the space look (SPL) used to calculate the operational calibration coefficients was locked during this period
Channel 10 striping and BDS update 5/19/2018 5/22/2018 Channel 10 striping was discovered. Caused by ground processing spacelook latchup after Detector #294 (indexing from zero) response level shifts (observed by both SPL and ICT data). Corrected with a BDS change.
Channel 10 Striping 6/3/2018 6/4/2018 Channel 10 striping was discovered. Caused by ground processing spacelook latchup after Detector #156 (indexing from zero) response level shifts (observed by both SPL and ICT data). This led to a bias of affected pixels that appears as a strip in image. Corrected by resetting space look count.
Channel 9 Striping 6/4/2018 6/4/2018 Channel 9 striping was discovered. Caused by ground processing spacelook latchup after Detector #303 (indexing from zero) response level shifts (observed by both SPL and ICT data). This led to a bias of affected pixels that appears as a strip in image. Corrected by resetting space look count.
Transient navigation anomaly fixed 10/15/2018 10/15/2018 Large navigation errors in all channels lasting for about one hour with a random occurrence were associated with the gaps in the Ground gyro rate processing and fixed in the Ground software upgrade.
Channel 9 striping and BDS update 10/27/2018 11/2/2018 Striping was discovered. Corrected with the BDS update.
Erroneous radiometric cal for VNIR bands 01/18/2019 01/22/2019 Incorrect VNIR bands gain began at 15:00UTC on 01/18/2019 and ended at 16:00UTC on 01/22/2019.Obvious striping was observed in bands 1 and 2 during the period.
Missing INST-CAL-M2 and EPH on 12/26/2018 12/26/2018 12/26/2018 Missing INST-CAL-M2 and EPH on 12/26/2018 from GS. However
DO.07 has a code bug in implemetation of CDRL 80 Rev F 10/15/2018 In equation 6.5-1 the integration factor was erroneously divided twice during the Q-scaling in DO.07.( WR5407/WR6348).
Mode 6 72-hour test run 2/19/2019 2/22/2019 Default Mode 6 version was run from 15 to 15 UTC.
GOES-16 HBT thruster Flush 3/12/2019 3/12/2019 A GOES-16 HBT Flush was performed from 2305UTC to 2315UTC with 10 minutes of product outage.Product navigation may be degraded for up to 45 minutes after the conclusion of the HBT flush. Event ended with a navigation anomaly - soft reset of Kalman filter elevating the image navigation errors for about three hours.
A persistent shift of BTD in GOES-16 6/15/2017 Bob Kuligowski group found a persistent shift in the time series of max and min bands 11-13 BTD values since 15 June 2017.
G16 band16 striping 03/31/2019 03/31/2019 Channel 16 detector #211 (0-based index) spacelook count mean was locked (latch-up) from 00:00z to 18:40z on 2019-03-31. Leading to more serious striping during the period. The latch-up was caused and released automatically with the random fluctuation of the spacelook.
G16 Transition to Mode 6 04/02/2019 New baseline Mode 6A is started at 16:00 UTC ; it replaced Mode 3E; link: https://www.ospo.noaa.gov/Operations/GOES/16/GOES-16%20Scan%20Mode%206.html
Unexpected G16 VNIR gain jumps 04/08/2019 04/09/2019 All the G16 VNIR bands experienced a unexpected large jump (>10%) after the GS software update (DO.07.02) on 04/08/2019. An unknown origin of the gains were used after this GS update. On 04/09/2019 the previous solar cal gain values derived with DO.07 using the 03/26 solar cal. data were re-applied to generate L1B data. Visible striping can be observed in the G16 L1B images during this abnormal period.
CPAF Update 04/23/2019 04/23/2019 Band 7 resampler updated at 20:15 UTC to correct the cold pixels around fire (CPAF).
G16 B02 bias correction 04/23/2019 1)GOES-16 new B02 K-LUT was implemented on GS at 11:00UTC on 04/23/2019(B02 with CWG's delivery. The other bands corrected with CDRL079_FM1_RevF); 2) calibration algorithm with RevG 3) instrument-to-spacecraft alignment angles with CDRL79-FM1_RevM. The major impact is that G16 B02 radiance is reduced by about ~6.2%.
North-South navigation anomaly 4/13/2019 04/13/2019 Anomalous North-South navigation shifts were observed by CWG in the full disk image at 23:00 UTC. The shift is strongest in the VNIR channels (up to 6 urad). The CONUS and MESO images produced in the period 23:00 to 23:10 may also be affected.
Navigation anomaly 05/04/2019 05/04/2019 Navigation anomaly and gap in data occurred from 12:00 to 13:00 UTC. IR channels may feature slightly elevated navigation errors (by less than 10 urad) during the next 24 hours.
Update the Kalman filter control LUTs 05/10/2019 05/10/2019 Deployed at 15:29 UTC this update is a temporary fix for the anomaly reported by ADR 955. This temporary fix will resolve the periodic Kalman filter issues that have been seen in the recent weeks and reported in ADR 955. The fix will be removed when the full fix is delivered in DO 09.
Update of Solar Avoidance Earth Mask 8/30/2018 8/30/2018 A new solar avoidance earth mask is implemented to: (1) Compensate for the difference as GOES-16 flying as GOES-East at 75.2W longitude while G16 ABI on-board configuration at 75.0W; and (2) Avoid of atmospheric refraction effects. Data outage occurred at 17:10Z - 17:15Z.
Possible image navigation problems 07/10/2019 07/10/2019 ABI images taken around 15:30 UTC may have navigation problems due to not fully-compensated moment adjustment.
Major upgrade of Product Generation (PG) at Ground System(GS) to DO.08.00.02 7/25/2019 including the correction of several issues concerning L1b products and the implementation of Predictive Calibration to improve GOES-17 Channel 8-16 calibration when the FPM temperature becomes unstable.
G16 ABI synchronization anomaly with PDA processing 08/17/2019 08/17/2019 For the period from 2019-08-17 0600 UTC to 2019-08-17 1650 UTC
G16 ABI synchronization anomaly with PDA processing 08/17/2019 08/18/2019 For the period from 2019-08-17 2120 UTC to 2019-08-18 0340 UTC
G16 band 9 stripes 08/26/2019 08/27/2019 G16 Channel 9 detector #31 (0-based index) spacelook count mean was locked (latch-up) at 22:30z on 2019-08-26 and caused stripes in L1b image after the time.The latch-up was released by manual spacelook reset at 12:26z on 2019-08-27 and the stripes disappear.
G16 ABI navigation anomaly 08/23/2019 08/23/2019 Navigation shift is detected by CENRAIS in the full-disk image of 20:30 UTC in the EW direction for all channels and for VNIR channels in NS direction. In the channel 2 image the shift is about 23 microradians in the East direction and 6 microradians in the South direction. Similar shifts may be present in the other imagery taken between 20:30 and 20:40 UTC.
G16 maneuver 10/30/2019 10/30/2019 ABI on GOES-16 had a scheduled data outage from 22:50 to 23:00 UTC due to the satellite maneuver. The images between 23:00 and 23:10 may have blank spaces
G16 navigation anomaly 11/01/2019 11/01/2019 ABI on GOES-16 had a data outage from 13:10 to 13:40 UTC due to antenna outage (intermediate frequency distribution switching switch error). During this period the images may have blank spaces and feature large navigation errors or be absent. First good full disk image is timed by 13:40 UTC.
 
Event StartDate EndDate Notes
Detectors added to dead row list 12/20/2018 The following detectors are added to the dead row list and skipped from l1b image generation: B8D91 B10D50 B10D149 B10D154 B11D35 B13D196 B15D333. This is a temporary method applied to reduce the strong striping at these IR bands.
Channels 8/10/11/12 striping 01/12/2019 01/18/2019 Striping due to elevated FPM temperature
G17 ABI Reset 1/3/2019 01/03/2019 G17 ABI was brought offline to implement a flight software update at ~1800UTC for two hours on 01/03/2019. GOES-17 ABI may experience degraded performance upon return to service while image navigation performance converges.
G17 ABI Mode6 test 12/27/2018 12/30/2018 Mode 6JKL timeline test
FPM peak temperature anomaly 11/25/2018 11/27/2018 Cryo-cooler reset tests during the "hot" FPM temperature periods on 11/25/2018-11/27/2018. Resulted in degraded IR imagery during these periods.
Mode 3G test run 11/15/2018 11/16/2018 Mode 3G test run (static spacelook); no FD L1B data during this period.
Detector map update 11/15/2018 11/15/2018 To improve the image navigation. Deployed at 18:48 UTC.
Kalman filter reset 11/15/2018 11/15/2018 Image navigation has temporarily degraded after KF reset at 18:32 UTC
B11 BDS update 11/14/2018 BDS for detector #203 updated
G17 drift to GOES-West 10/24/2018 11/13/2018 GOES-17 drifted from the test position (89.5W) to the GOES-West position (137.2W)
Data outage 10/23/2018 10/23/2018 L1B data outage between ~10:27 - ~13:02 UTC due to the flooding of sample outlier files (SOF) when scene saturated. The SOF clogged up the resampler and services crashed.
Detector map update 10/19/2018 10/19/2018 To improve the image navigation.
Visible star observation update 10/15/2018 10/15/2018 To improve precision of the star observation. Made in the framework of the ground processing upgrade.
Kalman filter parameter update 10/9/2018 10/9/2018 To improve convergence and stability of the filter. Translates to better image navigation.
Mode 3 timeline started 10/5/2018 Mode 3 started - Mode 6 ended.
Detector map update 10/4/2018 10/4/2018 To improve the image navigation. After update the Meso 1 and Meso 2 scans have used different detector maps for some time. The issue is under investigation.
Mode 6 started 10/2/2018 10/5/2018 Mode 6 started - Mode 4 ended.
Mode 4 started 10/1/2018 10/2/2018 Mode 4 started - Mode 6 ended.
Mode 6 started 9/26/2018 10/1/2018 Data distribution resumed with ABI in the Mode 6.
Yaw flip 9/24/2018 GOES-17 was conducted yaw-flip maneuver to inverted position.
Detector map update 9/20/2018 9/21/2018 To improve the image navigation.
Detector map update 9/13/2018 9/13/2018 To remove 3-pixel bias to the South in the LWIR channels. Deployed at 12:55 UTC.
BDS upload for IR bands 9/12/2018 BDS updates for large NEdT IR detectors.
Star detection parameter update 9/7/2018 9/7/2018 To improve the image navigation and stability. Deployed at 17:07 UTC.
Mode 3C implementation 9/5/2018 Mode 3C was deployed at 19:00 UTC. Results of the second and third blackbody calibrations only used for CONUS and MESO images.
Line Of Sight stability improvement 8/30/2018 8/30/2018 To improve the image navigation stability.
Band02 is ~9% brighter than SNPP/VIIRS 8/28/2018 G17 ABI B02 radiance is ~9% brighter than collocated SNPP VIIRS measurements.
PICA 8/28/2018 some of G17 ABI IR bands experience swath-to-swath meso-to-meso and CONUS-to-CONUS calibration variations
Star observation angle correction 8/9/2018 8/9/2018 To increase the number of observed stars.
Star observation angle correction 7/9/2018 7/9/2018 To enable IR star observation. That allowed to compensate for VNIR - MWIR offset. LWIR offset remained not fully compensated.
Mode 3 with extra stars started 7/5/2018 7/6/2018 Extra star observations increase stability of the image navigation.
Mode 3 started 7/2/2018 9/5/2018 Line Of Sight correction has enabled the start of the Mode 3 timeline.
Line of Sight correction 7/2/2018 7/2/2018 The correction has removed static offsets in the ABI pointing.
Yaw flip maneuver to original position 6/20/2018 6/20/2018 Performed between 17 and 19 UTC.
First Light Image 5/20/2018 5/20/2018 First Light image released.
Yaw flip maneuver to inverted position 5/16/2018 5/16/2018 Performed between 17 and 19 UTC.
Occurrence of "artificial" striping for the VNIR bands after DO7 10/15/2018 10/24/2018 Performed during this period; disappeared after drift.
Inaccurate GS solar gains on 10/18 and 11/24 10/18/2018 11/24/2018 Sudden gain drop in Band04.
Sudden change of solar cal gains at not-solar-calibration event time 11/14/2018 11/24/2018 Impact unknown on L1B images
Large oscillation of B02/B03 solar cal gains 8/30/2018 10/18/2018 Possible due to SD BRDF uncertainty.
VNIR bands incorrect gain 01/18/2019 01/19/2019 Incorrect VNIR bands gain began at 15:00UTC on 01/18/2019 and ended at 3:00UTC on 01/19/2019 after the solar calibration on 01/19/2019.
ABI hard reset 11/20/2018 11/21/2018 Began at 20:30 UTC and ended at 2:00 next day. Caused by the cryocooler anomaly. Large calibration and navigation anomalies afterward were caused by the need to reload various LUTs.
Crycoler anomaly 11/20/2018 Anomaly with the crycooler started around 10:15 UTC until the reset at 20:30 UTC
Crycooler anomaly 11/25/2018 Anomaly with the crycoller around 14:00 UTC; associated ABI reset also caused a range of calibration and navigation anomalies.
Mode 6F test run 11/27/2018 11/30/2018 Navigation is in family with the previous versions of Mode 6.
B09 BDS update 12/10/2018 Det#2:Column6->4. Det#52:Column6->1. Det#127:Column6->1
Simultaneous Mode 4 run on GOES-16 and GOES-17 12/04/2018 12/04/2018 Ran from 18 to 22 UTC; PDA output had some data gaps.
Mode 6J 24-hour test run 12/27/2018 12/28/2018 Run from 8 to 8 UTC. Navigation of visible and IR channels is in family with the previous versions of Mode 6. Time schedule appeared to be shorter than expected.
Mode 6L 24-hour test run 12/28/2018 12/29/2018 Run from 8 to 8 UTC. Navigation of visible channels is in family with the previous versions of Mode 6. Navigation of IR channels was broken.
Mode 6K 24-hour test run 12/29/2018 12/30/2018 Run from 8 to 8 UTC. Navigation of visible channels is in family with the previous versions of Mode 6. Navigation of IR channels was broken.
STAR SCDR outage 1/5/2019 1/7/2019 STAR SCDR did not accept G16/G17 data from PDA. The gap was later backfilled. Some backfill data were taken from GRB distribution. It was earlier noted by AWG that some GRB data may cause problems in L2 processing.
Mode 6M 48-hour test run 1/28/2019 1/30/2019 Run from 13 to 13 UTC; CWG evaluation of radiometric and geometric calibration is positive.
DO.07 has a code bug in implemetation of CDRL 80 Rev F 10/15/2018 In equation 6.5-1 integration factor was erroneously divided twice during the Q-scaling in DO.07.( WR5407/WR6348).
GOES-17 operational declaration as GOES-West 02/12/2019 GOES-17 is officially declared as the GOES-West satellite at 137.2 degrees west.
Initial gainset switch time 7/26/2018 10/24/2018 Gainset switch time set at the beginning of the PLT/PLPT period. Gainset 1->3: 0600 UTC. Gainset 3->1: 1500 UTC.
Gainset swith time after the satellite drift 11/13/2018 12/06/2018 Gainset 1->3: 0900 UTC. Gainset 3->1: 1900 UTC.
Gainset 3 turned on 1/18/2019 Gainset 1->3: 0830UTC and gainset 3->1: 1930UTC.
Gainset 3 turned off 12/06/2018 1/18/2019 Gainset 3 was turned off during this period.
Gainset switch time 11/30/2018 12/06/2018 Gainset 1->3: from 0900 UTC to 0830 UTC. Gainset 3->1: from 1900 UTC to 1930 UTC
Mode 6 72-hour test run 2/19/2019 2/22/2019 Version 6M was run from 15 to 15 UTC.
Mode 6 56-hour test run 2/25/2019 2/27/2019 Version 6M was run from 14 to 22 UTC.
G17 B04 and B06 GS gain decreasing 8/02/2018 8/27/2018 G17 B04 and B06 solar calibration gain values became abnormally decreasing.Resulting in dark trending of L1B radiance during this period(ADR754).
G17 B04 and B06 GS gain decreasing 12/26/2018 2/25/2019 G17 B04 and B06 solar cal gains displayed abnormal decreasing trending again. It resulted in dark trending of L1B radiance at these two channels. The previous event was in August 2018. ADR 754 and ADR 909.
G17 Mode 6 test run 03/19/2019 03/22/2019 Version 6M was run from 14:00 to 14:00 UTC.
G17 IR bands gain set3 turn off 03/16/2019 G17 IR bands gain set3 turn off.
G17 BDS update for selected IR detectors 03/22/2019 03/22/2019 G17 BDS map was updated for the following detectors to reduce striping and noise: B8D91 / B9D92 / B10D50 / B10D175 / B11D35 / B11D49 / B11D216 / B11D300 / B12D45 / B12D133 / B12D198 / B12D202 / B12D290 / B12D293 / B13D196 / B15D333 and 137 B16 detectors.
G17 B10 detector 231 saturation 03/21/2019 The detector saturated and caused serious striping in L1b. The striping was mostly removed by manual memory flush executed at 14z on 2019-03-22. The BDS map of the detector is updated to stop saturation.
G17 IR bands gain set III turned back on 03/28/2019 G17 IR bands gain set III was turned back on. Now the instrument is operated at the interleaved gain set I/III setting. Gainset I to III is switched at 0900UTC and Gainset III to I at 1900UTC.
G17 Yaw Flip 03/27/2019 03/27/2019 GOES-17 Yaw Flip accomplished on March 27 2019 2035-2159 UT; ABI data outages - incomplete last pre-flip images; few empty frames. Image navigation is good for all post-flip images.
G17 Transition to Mode 6 04/02/2019 New baseline Mode 6M is started at 16:00 UTC ; it replaced Mode 3C; link: https://www.ospo.noaa.gov/Operations/GOES/west/GOES-17_Scan_Mode_6.html.
G17 VNIR gain change with RevG algorithm 04/08/2019 G17 VNIR bands gains changed with the implementation of CDRL-80 RevG algorithm (DO.07.02) using the 04/02 solar cal data.
Abnormal G17 VNIR gains since the solar calibration event on April 12 2019 04/12/2019 G17 VNIR B04 and 06 experienced unexpected large drops of the operational solar cal gain values after the solar calibration event on 04/12/2019. Compared to the solar cal. gains on 04/08/2019 (DO.07.02) which were calculated based on the solar event on 04/02/2019. B04 dropped by 9.2%/B05 by 1.4%/B06 by 5.6%. All the changes were more than expected.
CPAF update 04/18/2019 04/18/2019 Band 7 resampler update at 18:32 UTC to correct the cold pixels around fire (CPAF).
G17 B02 bias correction 04/27/2019 G17 B02 bias correction was applied in GS at 15:40UTC on 04/27/2017 to reduce the radiance by about 6.9%. RevG algorithm was also implemented to cause the gain changes at B04-B06.
G17 Navigation anomaly 04/23/2019 4/23/2019 Anomalous navigation shifts were observed by CWG in the full disk image at 15:10 UTC for all channels. The images are shifted in both North-South and East-West directions. The largest shifts are in the EW direction of VNIR channels and amount up to 15 urad. The CONUS and MESO images produced in the period 15:10 to 15:20 may also be affected.
Kalman filter reset 04/27/2019 04/27/2019 Kalman filter reset after 13 UTC caused slightly elevated navigation residuals and ABI data gap from 1:30 to 3:20 UTC.
G17 Solar cal lunar intrusion rejection LUT update 05/05/2019 05/05/2019 Reduced striping or corrected bias at the G17 VNIR bands due to the update of solar spacelook count lunar intrusion rejection LUTs.
G17 Periodic striping for B11 04/23/2019 05/03/2019 Serious striping between 1900 - 0900 UTC daily caused by a detector (D241) saturation during Gain Set I. The detector was replaced at 1500 UTC on 05-03-2019.
Navigation anomaly 05/04/2019 05/04/2019 Anomalous navigation shifts and image loss were observed by CWG in the full disk image from 13:00 to 14:00 UTC for all channels. The images are shifted in both North-South and East-West directions. The largest shifts are in the EW direction of VNIR channels and amount up to 30 urad. The CONUS and MESO images produced in that period may also be affected.
Navigation anomaly 05/05/2019 05/05/2019 CWG has observed relatively-elevated EW navigation shift of up to 5 urad in WNIR channel full-disk images at 15:10 UTC. CONUS and MESO images collected from 15:10 to 15:20 UTC may also be affected.
Update the Kalman filter control LUTs 05/10/2019 05/10/2019 Deployed at 15:29 UTC this update is a temporary fix for the anomaly reported by ADR 955. This temporary fix will resolve the periodic Kalman filter issues that have been seen in the recent weeks and reported in ADR 955. The fix will be removed when the full fix is delivered in DO 09.
Gainset III removal 05/28/2019 07/15/2019 The daily gainset I and gainset III swap stopped on 05/28/2019.
North-South striping in GOES-17 Channel 2 image 05/31/2019 Multiple stripes along the north-south direction are found around 1830 - 1840 UTC since May 31 2019 (when clear). The stripes are centered at a solar farm in southern Calibration (35:20N/120:04W) and extend throughout one swath. They may persist until mid July.
Large image navigation errors 07/10/2019 07/10/2019 ABI images taken around 15:20 and 15:30 UTC may have large navigation errors due to the Kalman filter reset caused by the scheduled HBT flush.
Gainset III resume 07/16/2019 G17 IR bands gainset III daily turned on at 09:00Z; switched to gainset I at 19:00Z.
Sporadic missing data with DQF=-1 in CONUS/FD images 06/22/2019 06/22/2019 Missing data (radiance = 4095)with DQF=-1 was found in the CONUS/FD images at various bands and time that day. Similar incidents probably happened before.
Major GS upgrade to DO.08.00.02 07/25/2019 including the corrections of several issues concerning L1b products and the implementation of Predictive Calibration to improve GOES-17 Channel 8-16 calibration when the FPM temperature becomes unstable.
G17 ABI FD data gap 08/14/2019 08/14/2019 Data gap from 2019-08-14 0640 UTC to 2019-08-14 0830 UTC is caused by East-West encoder error or anomaly. It was resumed back to normal with the standard procedures.
G17 ABI FD data gap 08/15/2019 08/15/2019 Data gap from 2019-08-15 0540 UTC to 2019-08-15 1630 UTC is caused by encoder error or anomaly. It was resumed back to normal after parking the ABI sensor.
G17 ABI scanner calibration 08/16/2019 08/16/2019 ABI data outage from 2019-08-16 22:30 UTC to 2019-08-16 23:00 UTC due to the scanner calibration.
G17 ABI scanner calibration 08/17/2019 08/17/2019 ABI data outage from 2019-08-17 00:00 UTC to 2019-08-17 00:30 UTC due to the scanner verification.
G17 ABI navigation anomaly 07/31/2019 07/31/2019 Navigation shift is detected by CENRAIS in the full-disk image of 22:50 UTC in the EW and NS directions for all channels. In the channel 2 image the shift is about 8 microradians in the East direction and 15 microradians in the North direction. Similar shifts may be present in the other imagery taken between 22:50 and 23:00 UTC.
G17 band 11 striping 08/17/2019 09/09/2019 Channel 11 detector #49 (0-based index) spacelook count was unstable since 19:00z on 2019-08-17 and detector #305 was saturated since 02:15z on 2019-08-22. Both caused stripes in the Ch11 L1b image. The BDS of detector #49 was updated on 08/27 at 10:23z and the BDS of detector #305 was updated on 09/09 at 15:21z to remove the stripes.
Streaks at B02/B07/B16 images 06/27/2019 06/27/2019 Streaks can be observed at the G17 B02/B07/B16 FD/CONUS/MESO images collected at 05:12Z on 06/27/2019 due to the lunar intrusion in the spacelook.
G17 IR bands gain set3 turn off 09/10/2019 G17 IR bands gain set 3 is turned off.
G17 Yaw Flip 09/09/2019 09/09/2019 Yaw flip was carried out between 20:40 and 21:39 UTC. No data were provided during that period. Image navigation and data integrity after the flip are nominal.
Streaks at B02/B07/B10/B15 09/15/2019 09/15/2019 Streaks at the G17 B02/B07/B10/B15 FD/CONUS/MES images collected at 23:06 - 23:10Z.
G17 ABI image gap 09/20/2019 09/20/2019 17:20 and 17:30 UTC FD images are missing and 17:40 UTC FD images are partial for all channels. The data gap is caused by trial of antenna swap at NSOF. Only PDA output of FD and other images is affected
pCal on/off update 10/06/2019 The pCal is turned on at ~8:40z and off at ~19:20z so that the pCal on/off time will not collide with the gain set switch time at 08:30z and 19:30z.
G17 ABI TDQF LUT update 10/02/2019 10/02/2019 The G17 ABI Temperature Data Quality Flags (TDQF) thresholds for the IR bands were updated to flag the saturated data more effectively.
G17 ABI degraded images 10/01/2019 10/01/2019 ABI images dated from 13:39 to 22:30 UTC may be degraded due to the work on star tracker. Anomaly has impacted swath collection and alignment. Images may have missing blocks. Navigation errors are elevated at the start and the end of the period.
G17 IR bands gain set III resumed 10/06/2019 G17 IR bands gain set III was turned back on 10/06/2019. Now the instrument is operated at the interleaved gain set I/III setting. Gainset I to III is switched at 0830UTC and Gainset III to I at 1930UTC.
G17 cooling test I 10/15/2019 10/15/2019 The first phase test for the ABI 30 minute cooling timeline was conducted between 11:00 - 12:00 UTC. Only two Mode 4 timeline images were disseminated during this one hour. Some Band 2 data were missing.
Gain Optimization Test I 10/15/2019 10/15/2019 The gain adjustment test was conducted for B13/B14 during the Phase I cooling test period at approximately 11UTC-12UTC. The L1b images were severely damaged because the cooling test was executed concurrently. No noticeable impact in L1b was observed after 12 UTC.
G17 Cooling Test - Phase II 10/18/2019 10/21/2019 The second phase test for the ABI 30 minute cooling timeline was conducted between 0600 - 1200 UTC on 10/18/2019 - 10/21/2019. Only one Mode 4 timeline images were disseminated at every 30 minutes during these cooling test periods.
Gain Optimization Test II 10/18/2019 10/21/2019 The detector gains are adjusted for Bands 13 & 14 during the gain-set III period of 08:30 UTC - 19:30 UTC on 10/18/2019 - 10/21/2019. The adjustment adds the data availability for band 13 and reduces the noise for band 14.
Gain Optimization Test III 11/05/2019 11/06/2019 The detector gains are adjusted for Bands 13 & 14 during the gain-set III period of 08:30 UTC - 19:30 UTC on 11/05/2019 - 11/06/2019. Serious striping may be observed in Band 13 L1b images from 19:30 UTC to 19:35 UTC on 11/05/2019 and 11/06/2019 caused by the latched spacelook counts which were triggered by this gain optimization test.
Gain Optimization Test IV 11/07/2019 11/08/2019 The detector gains are adjusted for Band 14 during the gain-set period of 08:30 UTC - 19:30 UTC.