Subject: Administrative: GOES Spring 2018 Eclipse and Keep Out --001a113f963ccf15880565078578 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Topic: GOES Spring 2018 Eclipse and Keep Out Zone/Stray Light Exclusion Schedules and Impacts Date/Time Issued: February 12, 2018 1750 UTC Product(s) or Data Impacted: GOES-16 (GOES-East) ABI and GLM data and GOES-= 15 (GOES-West) Imager and Sounder Data Date/Time of Initial Impact: February 5, 2018 0415 UTC Date/Time of Expected End: May 4, 2018 0545 UTC Length of Outage: See details below Details/Specifics of Change: The Spring 2018 Eclipse and Keep Out Zone (KOZ)/Stray Light Exclusion (SLZ) schedules are now available on our web page at http://www.ospo.noaa.gov/Operations/GOES/eclipse.html For your convenience, the eclipse schedules are provided in HTML, Excel (1997-2003 and 2007-2010), and Adobe PDF formats. The schedules are for both the Imager and the Sounder instruments for GOES-15 (GOES-West). During eclipse season with the GOES-R satellite series Advanced Baseline Imager (ABI), stray light contamination is visible approximately 45 minutes before and after satellite local midnight (~0500 UTC for GOES-East) which is approximately 45 days before and after the vernal (March 20, 2018) and autumnal (September 22, 2018) equinox, in the form of a vertical beam of light that is more intense at the end closer to the Sun. Stray light contamination is often prominent in the images of visible and near infrared bands (bands 1=E2=80=936), although it can also be discerned in band 7 imag= es. This is a normal occurrence for the ABI. Stray light contamination and truncated swaths during the GOES-East Spring 2018 eclipse season will be apparent on ABI imagery: - Starting February 5, 2018 from approximately 0415 UTC - 0545 UTC each day in the Southern Hemisphere until March 20, 2018. - Starting March 20, 2018 from approximately 0415 UTC - 0545 UTC each day in the Northern Hemisphere until May 4, 2018. During eclipse season with the GOES-R satellite series Geostationary Lightning Mapper (GLM), solar intrusion into the lens assembly will result in localized blooming (false events) and saturation (blind regions) in the data. These effects will occur daily around the same time as the ABI (0415 UTC - 0545 UTC). The daily effects begin with many false events at the limb, which cover regions of varying size and location as the eclipse features move across the field of view. The false events will peak during the beginning and end of the eclipse season (~end of February and mid-April) and the 20-second files will intermittently peak in size above 3-5 MB per file during false events, which is well above the average of ~0.3 MB per file. The increased number of false events can cause an overflow condition in the electronics which saturates the event processing. This saturation creates blind regions in the data outside of the areas impacted by the solar intrusion. The length of these temporary outages depends on the region, and is on the order of minutes. A blooming filter is being developed to remove the event spikes, although lightning detection outages will remain in the affected regions. A data quality product is under development to notify users of impacts during future eclipse seasons. Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880 or SPSD User Services at SPSD.UserServices@noaa.gov Web Site(s) for applicable information: See http://www.ospo.noaa.gov/Operations/GOES/eclipse.html for full eclipse schedules. See http://www.ospo.noaa.gov/Operations/GOES/schedules.html for full GOES scanning schedules and scan sectors. See http://www.ssd.noaa.gov/PS/SATS/messages.html for this and other satellite related messages. This message was sent to ESPC.Notification@noaa.gov. You have been sent this and other notifications because you have opted in to receive it. If for any reason, you wish to unsubscribe, please contact ESPC Help Desk at ESPCOperations@noaa.gov or (301) 817-3880. Please note: it may take up to two business days to process your unsubscribe request. --001a113f963ccf15880565078578 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable

Topic: GOES Spring 2018 Eclipse and Keep Out Zone/Stray Light Exc= lusion Schedules and Impacts

Da= te/Time Issued: February 12, 2018 1750 UTC

Product(s) or Data I= mpacted: GOES-16 (GOES-East) ABI and GLM data and <= /span>GOES-1= 5 (GOES-West) Imager and Sounder Data

Date/Time of Initial Impact: February 5, 2018 0415 UTC

D= ate/Time of Expected End: May 4, 2018 0545 UTC

Length of Outag= e: =C2=A0See details below

Details/Specifics of Change:<= /span>

Th= e Spring 2018 Eclipse and Keep Out Zone (KOZ)/Stray Light Exclusion (SLZ) s= chedules are now available on our web page at http://www.ospo.noaa.gov/Operations/GOES/eclipse.ht= ml


For your convenience, the eclipse schedules are provided in HTML, = Excel (1997-2003 and 2007-2010), and Adobe PDF formats. The schedules are f= or both the Imager and the Sounder instruments for GOES-15 (GOES-West).


= During eclipse season with the GOES-R satellite series Advanced Baseline Im= ager (ABI), stray light contamination is visible approximately 45 minutes b= efore and after satellite local midnight (~0500 UTC for GOES-East) which is= approximately 45 days before and after the vernal (March 20, 2018) and aut= umnal (September 22, 2018) equinox, in the form of a vertical beam of light= that is more intense at the end closer to the Sun. Stray light contaminati= on is often prominent in the images of visible and near infrared bands (ban= ds 1=E2=80=936), although it can also be discerned in band 7 images. This i= s a normal occurrence for the ABI.

=C2=A0

Stray light contamination and= truncated swaths during the GOES-East Spring 2018 eclipse season will be a= pparent on ABI imagery:

  • Starting = February 5, 2018 from approximately 0415 UTC - 0545 UTC each day in the Sou= thern Hemisphere until March 20, 2018.

  • Starting March 20, 2018 from approx= imately 0415 UTC - 0545 UTC each day in the Northern Hemisphere until May 4= , 2018.

=C2=A0

During eclipse sea= son with the GOES-R satellite series Geostationary Lightning Mapper (GLM), =C2= =A0solar intrusion into the lens assembly will result in localized blooming= (false events) and saturation (blind regions) in the data. These effects w= ill occur daily around the same time as the ABI (0415 UTC - 0545 UTC). The = daily effects begin with many false events at the limb, which cover regions= of varying size and location as the eclipse features move across the field= of view. The false events will peak during the beginning and end of the ec= lipse season (~end of February and mid-April) and the 20-second files will = intermittently peak in size above 3-5 MB per file during false events, whic= h is well above the average of ~0.3 MB per file.

=C2=A0

The increased nu= mber of false events can cause an overflow condition in the electronics whi= ch saturates the event processing. This saturation creates blind regions in= the data outside of the areas impacted by the solar intrusion. The length = of these temporary outages depends on the region, and is on the order of mi= nutes. A blooming filter is being developed to remove the event spikes, alt= hough lightning detection outages will remain in the affected regions. A da= ta quality product is under development to notify users of impacts during f= uture eclipse seasons.


Cont= act Information for Further Information: ESPC Opera= tions at ESPCOperations@noaa.gov o= r 301-817-3880 or SPSD User Services at SPSD.UserServices@noaa.gov

=C2=A0

=

Web Site(s) for applicable information:

See http://www.ospo.noaa.gov/Operations/GOES/eclipse.html for full eclipse sc= hedules.

See http://ww= w.ospo.noaa.gov/Operations/GOES/schedules.html for full GOES scanning schedu= les and scan sectors.

See http:/= /www.ssd.noaa.gov/PS/SATS/messages.html for this and other satellite related= messages.

=C2=A0

This message was sent to <= /span>ESPC.Notification@noaa.gov. You = have been sent this and other notifications because you have opted in to re= ceive it. If for any reason, you wish to unsubscribe, please contact ESPC H= elp Desk at ESPCOperations@noaa.gov or (301) 817-3880. Please note: it may take up to two business days to process = your unsubscribe request.

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