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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 March 22, 1999 to April 20, 1999. LUNAR INTRUSIONS 03/29 1351 to 1642 UTC 03/30 1436 to 1727 UTC 04/02 1647 to 1938 UTC 04/16 0237 to 0707 UTC BEVEL None Scheduled SOLAR INTRUSIONS 03/23 0237 to 0707 UTC 03/24 0237 to 0707 UTC 03/25 0237 to 0707 UTC 03/26 0237 to 0707 UTC 03/27 0237 to 0707 UTC 03/28 0237 to 0707 UTC 03/29 0237 to 0707 UTC 03/30 0237 to 0707 UTC 03/31 0237 to 0707 UTC 04/01 0237 to 0707 UTC 04/02 0237 to 0707 UTC 04/03 0237 to 0707 UTC 04/04 0237 to 0707 UTC 04/05 0237 to 0707 UTC 04/06 0237 to 0707 UTC 04/07 0237 to 0707 UTC 04/08 0237 to 0707 UTC 04/09 0237 to 0707 UTC 04/10 0237 to 0707 UTC 04/11 0237 to 0707 UTC 04/12 0237 to 0707 UTC 04/13 0237 to 0707 UTC 04/14 0237 to 0707 UTC 04/15 0237 to 0707 UTC 04/16 0237 to 0707 UTC 04/17 0237 to 0707 UTC 04/18 0237 to 0707 UTC 04/19 0237 to 0707 UTC 04/20 0237 to 0707 UTC --------------------------------------- Following are times of GOES-10 single chord operations for the period March 22, 1999 to April 20, 1999. LUNAR INTRUSIONS 03/29 1800 to 2051 UTC 04/01 2011 to 2303 UTC 04/02 2055 to 2345 UTC 04/16 0713 to 1153 UTC BEVEL None Scheduled SOLAR INTRUSIONS 03/23 0713 to 1153 UTC 03/24 0713 to 1153 UTC 03/25 0713 to 1153 UTC 03/26 0713 to 1153 UTC 03/27 0713 to 1153 UTC 03/28 0713 to 1153 UTC 03/29 0713 to 1153 UTC 03/30 0713 to 1153 UTC 03/31 0713 to 1153 UTC 04/01 0713 to 1153 UTC 04/02 0713 to 1153 UTC 04/03 0713 to 1153 UTC 04/04 0713 to 1153 UTC 04/05 0713 to 1153 UTC 04/06 0713 to 1153 UTC 04/07 0713 to 1153 UTC 04/08 0713 to 1153 UTC 04/09 0713 to 1153 UTC 04/10 0713 to 1153 UTC 04/11 0713 to 1153 UTC 04/12 0713 to 1153 UTC 04/13 0713 to 1153 UTC 04/14 0713 to 1153 UTC 04/15 0713 to 1153 UTC 04/16 0713 to 1153 UTC 04/17 0713 to 1153 UTC 04/18 0713 to 1153 UTC 04/19 0713 to 1153 UTC 04/20 0713 to 1153 UTC ------------------------------------------ Steve Arnett Satellite Analysis Branch Satellite Services Division NOAA/NESDIS steve.arnett@xxxxxxxx --------------------------- End Of Message -----------------------------------
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