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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 January 31, to February 26, 2002. LUNAR INTRUSIONS 01/31 1817 to 2110 UTC 02/15 0237 to 0836 UTC BEVEL 01/31 0237 to 0707 UTC 02/01 0237 to 0707 UTC 02/02 0237 to 0707 UTC 02/03 0237 to 0707 UTC 02/04 0237 to 0707 UTC 02/05 0237 to 0707 UTC 02/06 0237 to 0707 UTC 02/07 0237 to 0707 UTC 02/08 0237 to 0707 UTC 02/09 0237 to 0707 UTC 02/10 0237 to 0707 UTC 02/11 0237 to 0707 UTC 02/12 0237 to 0707 UTC 02/13 0237 to 0707 UTC 02/14 0237 to 0707 UTC 02/16 0237 to 0707 UTC 02/17 0237 to 0707 UTC 02/18 0237 to 0707 UTC SOLAR INTRUSIONS 02/19 0237 to 0707 UTC 02/20 0237 to 0707 UTC 02/21 0237 to 0707 UTC 02/22 0237 to 0707 UTC 02/23 0237 to 0707 UTC 02/24 0237 to 0707 UTC 02/25 0237 to 0707 UTC 02/26 0237 to 0707 UTC --------------------------------------- Following are times of GOES-10 single chord operations for the period January 31, to February 26, 2002. LUNAR INTRUSIONS 01/31 2223 to 0116 UTC 02/03 0006 to 0258 UTC 02/17 1114 to 1405 UTC BEVEL 01/31 0713 to 1153 UTC 02/01 0713 to 1153 UTC 02/02 0713 to 1153 UTC 02/03 0713 to 1153 UTC 02/04 0713 to 1153 UTC 02/05 0713 to 1153 UTC 02/06 0713 to 1153 UTC 02/07 0713 to 1153 UTC 02/08 0713 to 1153 UTC 02/09 0713 to 1153 UTC 02/10 0713 to 1153 UTC 02/11 0713 to 1153 UTC 02/12 0713 to 1153 UTC 02/13 0713 to 1153 UTC 02/14 0713 to 1153 UTC 02/15 0713 to 1153 UTC 02/16 0713 to 1153 UTC SOLAR INTRUSIONS 02/18 0713 to 1153 UTC 02/19 0713 to 1153 UTC 02/20 0713 to 1153 UTC 02/21 0713 to 1153 UTC 02/22 0713 to 1153 UTC 02/23 0713 to 1153 UTC 02/24 0713 to 1153 UTC 02/25 0713 to 1153 UTC 02/26 0713 to 1153 UTC ------------------------------------------ Tom Renkevens Satellite Analysis Branch (SAB) Satellite Services Division (SSD) NOAA/NESDIS/OSDPD thomas.renkevens@xxxxxxxx
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