Update #2: On Oct 25, 2018, the MHS (Microwave
Humidity Sounder) was commanded to standby mode to perform a
table dump, which took longer than usual, likely due to high
friction in the drive motor.
On Oct 29, 2018, it was commanded to power-on mode,
and it was attempted to bring it back to scan mode, however it
entered fault mode instead.
On Oct 30, 2018, the MHS was powered off, and a
full power on sequence was attempted, however this failed and
the MHS entered fault mode.
On Nov 1, 2018, a sensor swap from A to B was
attempted on the MHS, however this failed due to the MHS
electronics being switched off.
On Nov 2, 2018, the sensor swap was completed
successfully and a power on sequence was attempted, however the
MHS still entered fault mode.
As of this time, data is still unusable. An ARB
(anomaly review board) Team has been formed and NOAA Engineering
continues to investigate this anomaly with EUMETSAT. Our next
step is to change to the redundant PIE (processing interface
electronics) on Monday November 5, 2018. Further updates will
be provided.
Update #1: Engineering investigation is ongoing, no immediate action planned.
Topic: NOAA-18 MHS degraded science
data
Date Issued:
November 2, 2018 2025Z
Product(s) or Data Impacted: All MHS channels have developed striping
Date/Time
of Initial Impact: October
22, 2018 1800Z
Date/Time
of End: TBD
Length
of Event: TBD
Details/Specifics
of Change: At
around 1800Z the NOAA-18 reflector drive motor current became
irregular causing scan control errors. This resulted in all 5
MHS channels developing channel striping. See the STAR Web site
for Global image impact at https://www.star.nesdis.noaa.gov/icvs/status_N18_MHS.php
Problem is being investigated by Engineering.
Contact
Information for Further Information: ESPC
Help DeskatESPCOperations@noaa.govat301-817-3880
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