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GOES "single chord" operations, made necessary by lunar and solar intrusions at the edge of the Earth disk, impact navigation and registration for short periods. Users of GOES GVAR data will see variable errors during periods of single chord operations as noted below. Single Chord Operations for the Bevel effect are listed when applicable. Bevel effect operation is intended to avoid a seasonal spacecraft pointing problem with all GOES spacecraft caused by the sun's light reflecting into the earth sensor. Following are times of GOES-8 single chord operations for the period December 20, 2001, to January 10, 2002. LUNAR INTRUSIONS 12/22 0910 to 1200 UTC 12/25 1114 to 1405 UTC 01/04 2023 to 2315 UTC 01/06 2201 to 0053 UTC BEVEL None SOLAR INTRUSIONS None --------------------------------------- Following are times of GOES-10 single chord operations for the period December 20, 2001 to January 10, 2002. LUNAR INTRUSIONS 12/22 1319 to 1610 UTC 01/05 0033 to 0324 UTC 01/07 0210 to 0502 UTC BEVEL None SOLAR INTRUSIONS None ------------------------------------------ Tom Renkevens Satellite Analysis Branch (SAB) Satellite Services Division (SSD) NOAA/NESDIS/OSDPD thomas.renkevens@xxxxxxxx
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