Single Chord Operations - Issued 4/19/99


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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 April 19, 1999 to May 18, 1999.


LUNAR INTRUSIONS

04/26          1219 to 1528 UTC
04/29          1447 to 1737 UTC
05/10          2328 to 0220 UTC
05/14          0206 to 0459 UTC

BEVEL

04/22          0237 to 0707 UTC
04/23          0237 to 0707 UTC
04/24          0237 to 0707 UTC
04/25          0237 to 0707 UTC
04/26          0237 to 0707 UTC
04/27          0237 to 0707 UTC
04/28          0237 to 0707 UTC
04/29          0237 to 0707 UTC
04/30          0237 to 0707 UTC
05/01          0237 to 0707 UTC
05/02          0237 to 0707 UTC
05/03          0237 to 0707 UTC
05/04          0237 to 0707 UTC
05/05          0237 to 0707 UTC

SOLAR INTRUSIONS

04/19          0237 to 0707 UTC
04/20          0237 to 0707 UTC
04/21          0237 to 0707 UTC

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Following are times of GOES-10 single chord operations for the
period April 19, 1999 to May 18, 1999.

LUNAR INTRUSIONS


04/25          1535 to 1849 UTC
04/26          1643 to 1934 UTC
04/29          1853 to 2144 UTC
05/11          0332 to 0631 UTC


BEVEL

04/21          0713 to 1153 UTC
04/22          0713 to 1153 UTC
04/23          0713 to 1153 UTC
04/24          0713 to 1153 UTC
04/25          0713 to 1153 UTC
04/26          0713 to 1153 UTC
04/27          0713 to 1153 UTC
04/28          0713 to 1153 UTC
04/29          0713 to 1153 UTC
04/30          0713 to 1153 UTC
05/01          0713 to 1153 UTC
05/02          0713 to 1153 UTC
05/03          0713 to 1153 UTC
05/04          0713 to 1153 UTC
05/05          0713 to 1153 UTC
05/06          0713 to 1153 UTC
05/07          0713 to 1153 UTC
05/08          0713 to 1153 UTC
05/09          0713 to 1153 UTC

SOLAR INTRUSIONS

04/19          0713 to 1153 UTC
04/20          0713 to 1153 UTC


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Steve Arnett
Satellite Analysis Branch
Satellite Services Division
NOAA/NESDIS
steve.arnett@xxxxxxxx





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Linda Miller
External Liaison, Unidata
University Corporation for Atmospheric Research
P.O. Box 3000
Boulder, CO 80307-3000
303 497-8646 fax: 303-497-8690
URL:  http:/www.unidata.ucar.edu/staff/lmiller/un.act.html