20060328: solar eclipse impact

  Total Solar Eclipse Impact on POES data

*Date/Time(UTC) Message Issued:*
   27 March 2006/1800 UTC

*Satellite(s) Involved:*

*Instrument(s) Involved:*
   All Instruments

*Product(s) Involved/Affected:*
  All products (except HRPT)

*Date/Time(UTC) of Initial Implementation:*
   29 March 2006, 0737  UTC (start of effect in POES data)

*Details/Specifics of Change:*
SOCC has reported the following:
There will be a total solar eclipse on March 29th jday 088 from approximately 07:37 through 12:46Z. This sun-moon eclipse has been analyzed by the EMOSS eclipse model. This eclipse will affect all POES spacecraft over the course of 3 orbits.

On Wednesday, 2006 March 29, a total eclipse of the Sun will be visible from within a narrow corridor which traverses half the Earth. The path of the Moon's umbra1 shadow begins in Brazil and extends across the Atlantic, northern Africa, and central Asia where it ends at sunset in western Mongolia. A partial eclipse will be seen within the much broader path of the Moon's penumbral shadow, which includes the northern two thirds of Africa, Europe, and central Asia. Links related to this eclipse can be found at the following:
http://www.exploratorium.edu/eclipse/2006/index.html (This link will have a live webcast from Turkey)

_Satellite-NOAA-12: Eclipse Times_
Start Time    Stop Time    Duration
(UTCG)      (UTCG)         (sec)         Obstruction
7:57:13         8:09:55         761.761         Moon
10:51:19     10:52:26           67.047         Moon
12: 18:48    12:30:11         682.531         Moon

_Satellite-NOAA-14: Eclipse Times_
Start Time    Stop Time    Duration
(UTCG)      (UTCG)         (sec)         Obstruction
8:27:51         8:40: 16     745.234             Moon
10:00:15     10:10:26      610.93               Moon
11 :09:15     11 :30:37     1281.434     EarthIMoon

Satellite-NOAA-15: Eclipse Times
Start Time    Stop Time    Duration
(UTCG)      (UTCG)         (sec)         Obstruction
8:06:39         8:21:03         864.677         Moon
10:58:17     11:06:01         463.853         Moon
12:30:16     12:40:27         611.198         Moon

_Satellite-NOAA-16: Eclipse Times_
Start Time    Stop Time    Duration
(UTCG)      (UTCG)         (sec)         Obstruction
10:50:10     11:04:36        866.038         Moon

_Satellite-NOAA-17: Eclipse Times_
Start Time    Stop Time    Duration
(UTCG)      (UTCG)         (sec)         Obstruction
8:52:18         9:03:10         652.27           Moon
10:21:53     10:35:00         786.926         Moon
11:30:36     11:52:06       1290.059     EarthIMoon

_Satellite-NOAA-18: Eclipse Times_
Start Time    Stop Time    Duration
(UTCG)      (UTCG)         (sec)         Obstruction
10:23:12       10:37:23      851.385         Moon

No yaw updates will occur during any eclipse event so autonomous swap to YGC mode is not a concern.

*Contact Person(s) Name/Email/Phone Number for Questions:*
 Emily Harrod  Emily.Harrod@xxxxxxxx  301-457-5247 ext. 117
 Renee Smith  Renee.Smith@xxxxxxxx  301-817-4117

*Web site(s) that contain other relevant information (where applicable):*
    http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B notices
    http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices
    http://www.oso.noaa.gov/poes/index.htm - SOCC polar satellite status
    http://www.oso.noaa.gov/goes/index.htm - SOCC geostationary satellite 
http://www.oso.noaa.gov/daily-news/index.asp <http://www.oso.noaa.gov/daily-news/index.htm> - SOCC morning reports

* Emily D. Harrod
* Computer Operations Branch
* Pre-Product Processing Group
* E/SP11, Federal Building #4, room 0318
* 5200 Auth Road
* Suitland, Maryland  20746-4304
* voice 301-457-5247 ext 117
* fax   301-457-5199
* email Emily.Harrod@xxxxxxxx

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