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MTSAT-1R
Schedule for Equinox Season

Sun Interference in Spring 2010

The sun passes behind a satellite as seen from its ground station once a day during equinox season. When this happens, radiation from the sun can cause loss or degradation of communications between the satellite and the ground station. This kind of sun interference can distort images or interrupt their transmission.

Sun interference is expected this year as follows:

  • F03: March 3 - 9, 2010

Sun Avoidance Operation in Spring 2010

Likewise, the sun and the earth can lie in an approximate line with a satellite during equinox season. When this happens, sunlight entering the satellite's imager-sensor can adversely affect the sensor's calibration quality and cause deterioration of image data. To prevent this, the imager-sensor is controlled to avoid observing near-sun areas, and earth images consequently have a chipped area. This kind of control is known as sun avoidance operation.

Operation for this year is scheduled as follows:

  • (1) Observation cancelled (shown with "XXX-XX (red box)" in the table below)
    • F15: April 9- 18, 2010
    • N15: April 2-10, 2010
  • (2) Other than the observations above, parts of some images at N14, F15 and N15 from February 18 until April 20, 2010 will be chipped to avoid the influence of solar light on the imager.
(Last update: February 15, 2010)
Observation F14 N14 F15 N15 F16 N16
UTC 13:29-13:55 13:56-14:13 14:29-14:55 14:56-15:13 15:29-15:55 15:56-16:13
Feb. 15 O O O O O O
Feb. 16 O O O O O O
Feb. 17 O O O O O O
Feb. 18 O O S-0 O O O
Feb. 19 O O S-0 O O O
Feb. 20 O O S-10 O O O
Feb. 21 O O S-10 O O O
Feb. 22 O O S-10 O O O
Feb. 23 O O SSW-10 O O O
Feb. 24 O O SSW-10 O O O
Feb. 25 O O SSW-10 O O O
Feb. 26 O O SSW-20 O O O
Feb. 27 O O SSW-20 O O O
Feb. 28 O O O O O O
Mar. 1 O O O O O O
Mar. 2 O O O O O O
Mar. 3 O O O O O O
Mar. 4 O O O O O O
Mar. 5 O O O O O O
Mar. 6 O O O O O O
Mar. 7 O O O O O O
Mar. 8 O O O O O O
Mar. 9 O O O O O O
Mar. 10 O O O O O O
Mar. 11 O O O O O O
Mar. 12 O O O O O O
Mar. 13 O WSW-0 O O O O
Mar. 14 O WSW-0 O O O O
Mar. 15 O WSW-10 O O O O
Mar. 16 O WSW-10 O O O O
Mar. 17 O WSW-10 O O O O
Mar. 18 O W-10 O O O O
Mar. 19 O W-10 O O O O
Mar. 20 O W-10 O O O O
Mar. 21 O W-10 O O O O
Mar. 22 O W-10 O O O O
Mar. 23 O W-10 O O O O
Mar. 24 O W-10 O O O O
Mar. 25 O W-10 O O O O
Mar. 26 O W-10 O O O O
Mar. 27 O WNW-10 O O O O
Mar. 28 O WNW-10 O O O O
Mar. 29 O WNW-10 O O O O
Mar. 30 O WNW-10 O O O O
Mar. 31 O WNW-10 O O O O
Apr. 1 O WNW-10 O O O O
Apr. 2 O WNW-10 O NE-20 O O
Apr. 3 O WN-10 O NE-20 O O
Apr. 4 O WN-10 O NE-20 O O
Apr. 5 O WN-10 O NE-20 O O
Apr. 6 O WN-10 O NE-20 O O
Apr. 7 O WN-10 O NE-20 O O
Apr. 8 O WN-10 O NNE-20 O O
Apr. 9 O O NNW-20 NNE-10 O O
Apr. 10 O O NNW-20 NNE-10 O O
Apr. 11 O O NNW-20 NNE-10 O O
Apr. 12 O O NNW-10 NNE-10 O O
Apr. 13 O O NNW-10 NNE-10 O O
Apr. 14 O O NNW-10 NNE-10 O O
Apr. 15 O O NNW-10 NNE-10 O O
Apr. 16 O O NNW-10 NNE-0 O O
Apr. 17 O O N-10 NNE-0 O O
Apr. 18 O O N-10 O O O
Apr. 19 O O N-0 O O O
Apr. 20 O O N-0 O O O
Apr. 21 O O O O O O
Apr. 22 O O O O O O
Apr. 23 O O O O O O
Apr. 24 O O O O O O
Apr. 25 O O O O O O
UTC 13:29-13:55 13:56-14:13 14:29-14:55 14:56-15:13 15:29-15:55 15:56-16:13
Observation F14 N14 F15 N15 F16 N16

Lacking area on image (ratio for half disc)
Lacking area on image
  • O: Normal
  • xxx: Direction
  • xxx- 0: about 0% bit chip
  • xxx-10: about 10% bit chip
  • xxx-20: about 20% bit chip
  • xxx-30: about 30% and/or over 30% bit chip
  • xxxx: Observations to be cancelled