970110: GOES update

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: 970110: GOES update
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Fri, 10 Jan 1997 06:31:49 -0700 (MST)

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NATIONAL TECHNICAL INFORMATION MESSAGE /NTEM/ 97-3
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
800 AM EST FRI JAN 10 1997
 
TO:       FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER
          WIRE SERVICE /NWWS/ SUBSCRIBERS...OTHER NATIONAL
          WEATHER SERVICE /NWS/ CUSTOMERS...NWS EMPLOYEES
 
FROM:     RONALD S. GIRD...SATELLITE PROGRAM MANAGER
          OFFICE OF METEOROLOGY
 
          JAMISON HAWKINS
          NOAA/NESDIS GOES PRODUCT MANAGER
 
SUBJECT:  UPDATE ON GOES-8 OPERATIONS OUTAGE
 
     AT APPROXIMATELY 1330 UTC ON JANUARY 9 1997...GOES-8 LOST
EARTH LOCK AND ITS ON BOARD SOFTWARE WENT TO "SAFE MODE".  THE
FOLLOWING IS AN UPDATED MESSAGE ON THE SITUATION...WHICH
SUPERSEDES NTEM 97-2.
     
     NOAA CONTINUES TO ANALYZE THE GOES-8 PROBLEM...WHICH NOW
SEEMS TO BE UNRELATED TO AN ELECTROSTATIC DISCHARGE.  DATA NOW
INDICATE THAT THE ATTITUDE AND ORBIT CONTROL COMPUTER /AOCE#2/ IS
NOT RECEIVING TELEMETRY FROM ONE OF TWO MOMENTUM WHEELS WHICH
KEEP THE SPACECRAFT FACING THE EARTH PROPERLY.  A FIX HAS BEEN
IDENTIFIED WHICH WILL REQUIRE USING A BACK-UP MOMENTUM WHEEL
CONFIGURATION KNOWN AS L2.
     
     TO BEGIN L2 OPERATIONS...NOAA WILL BRING GOES-8 OUT OF SAFE
HOLD AT APPROXIMATELY 5:00PM EST /2200UTC/ TODAY...FRIDAY JANUARY
10TH.  ABOUT TWO HOURS LATER...AROUND 7:00 PM EST /0000 UTC
SATURDAY...JANUARY 11/...IMAGERY AND SOUNDER GOES VARIABLE /GVAR/
DATA SHOULD BEGIN FLOWING FROM THE SATELLITE.  OPERATIONAL
PRODUCTS FROM NOAA FOR THE NATIONAL WEATHER SERVICE SHOULD RESUME
AT THAT TIME.
     
     NASA SPACE SHUTTLE LAUNCH IS SCHEDULED FOR SUNDAY...
01/12/97.  THIS USUALLY CALLS FOR GOES-8 RAPID INTERVAL SCANNING
OPERATIONS /RISOP/ PRIOR TO LAUNCH.  THE NATIONAL WEATHER SERVICE
WILL CONTACT ITS SPACEFLIGHT METEOROLOGY GROUP /SMG/ TO DISCUSS
THIS NEED.  ALSO...SATELLITE PRODUCTS...ASOS CLOUD INFORMATION/
PRECIP ESTIMATES/WINDS...HAVE A STRONG DEPENDENCE ON GOOD
ACCURATE NAVIGATION.  THEREFORE SOME OF THESE PRODUCTS ALTHOUGH
PRODUCED BY NESDIS MAYBE DEGRADED UNTIL NAVIGATION/ GRIDDING IS
RESTORED TO NORMAL OPERATIONS.
     
     HOWEVER...ALL USERS SHOULD NOTE THAT IT MAY TAKE 48 HOURS OR
LONGER FOR ACCURATE NAVIGATION AND REGISTRATION TO RETURN TO
GOES-8 IMAGERY.
     
     WE WILL KEEP YOU INFORMED OF ANY CHANGES IN THIS SCHEDULED
FIX DURING THE DAY FRIDAY.
     
     FOR FURTHER QUESTIONS ON THE SITUATION...YOU MAY CONTACT...
 
     JAMISON HAWKINS
     NOAA/NESDIS
     GOES PRODUCT MANAGER
     301-457-5125
 
...NOTE TO INTERNET USERS...
 
THIS AND ALL OTHER NWS SERVICE CHANGE NOTIFICATIONS ARE
AVAILABLE ON THE NWS OFFICE OF METEOROLOGY/S HOME PAGE IN THE
NOTIFICATION SECTION.  THE URL ADDRESS OF THE NOTIFICATION
SECTION /IN SMALL CASE LETTERS/ IS
 
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM
 
END