Subject: Administrative: Suomi-NPP ATMS Scan Reversal timings This is a multi-part message in MIME format. --Boundary_(ID_oAhV6MxHfUrRVqk/0YsW3w) Content-type: text/plain; charset=utf-8; format=flowed Content-transfer-encoding: 7BIT *Topic:* S-NPP ATMS Scan Reversal timings impacted on December 6, 2017 *Date/Time Issued: * December 6, 2017 1629Z * * *Product(s) or Data Impacted:* None Expected ** *Date/Time of Initial Impact:* December 6, 2017 1655Z *Date/Time of Expected End:* December 6, 2017 2115Z *Length of Event:* See details below *Details/Specifics of Change:* On Wednesday December 6, S-NPP will conduct an on-orbit test of activating the On-board Stored Maneuver Sequence (OSMS) Command Block Memory (CBM) from the Block 2.0 ground system to determine the timings and delays associated with activating the CBM from Block 2.0. CBM activation, and CBM backout will be commanded from Block 2.0 during Svalbard contacts and as a result some of the ATMS Scan Reversals may be missed and/or manually commanded from ground. No other instrument or data impacts are expected, as the CBM will be stopped and backed out before any spacecraft reconfiguration occurs. Timeline of activities are as follows: SVL 31657 (16:52Z - 17:04Z) 16:54:28Z On-board Command Stored Memory (CSM) activates 3-orbit ATMS Scan Reversal CBM. 16:54:28Z - 16:55:01Z: CBM executed Scan Reversal at 70deg N. Lat. executed nominally 16:56Z (Approx.): Ground commanded activation of OSMS CBM. Stops any running CBMs, so further ATMS Scan Reversals wouldn't occur as scheduled automatically. 17:01Z (Approx.): Ground commanded stop of OSMS CBM 17:02Z CSM continues execution nominally 17:45:12Z: ATMS Scan Reversal will not be executed at 70deg S. Lat. SVL 31658 (18:35Z - 18:46Z) 18:39Z Backout the OSMS CBM and reconfigure spacecraft to nominal 18:45Z: Approximate time for ground commanded activation of dual ATMS scan reversal CBM, and may not be at pre-determined latitude. Subject to miss reversal during this orbit. 19:35Z: Approximate time for 2nd ATMS scan reversal during orbit 31658, and may not be at pre-determined latitude. Subject to miss reversal during this orbit. SVL 31659 (20:18Z - 20:30Z) 20:21Z: Approximate time for ground commanded activation of dual ATMS scan reversal CBM, and may not be at pre-determined latitude. Subject to miss reversal during this orbit. 21:10Z Approximate time for 2nd ATMS scan reversal during orbit 31659, and may not be at pre-determined latitude. Subject to miss reversal during this orbit. 21:58:58Z: Nominal 3-orbit ATMS Scan Reversal cadence resumes when ATMS Scan Reversal CBM activated from on-board CSM ** *Contact Information for Further Information: *ESPC Operations at ESPCOperations@noaa.gov at (301)817-4799. *Web Site(s) for applicable information:* See http://www.ssd.noaa.gov/PS/SATS/messages.html for this and other satellite related messages. This message was sent from 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) 817-4799. Please note: it may take up to two business days to process your unsubscribe request. --Boundary_(ID_oAhV6MxHfUrRVqk/0YsW3w) Content-type: text/html; charset=utf-8 Content-transfer-encoding: 8BIT

Topic: S-NPP ATMS Scan Reversal timings impacted on December 6, 2017

Timeline of activities are as follows:

SVL 31657 (16:52Z - 17:04Z)
16:54:28Z On-board Command Stored Memory (CSM) activates 3-orbit ATMS Scan Reversal CBM.
16:54:28Z - 16:55:01Z: CBM executed Scan Reversal at 70deg N. Lat. executed nominally
16:56Z (Approx.): Ground commanded activation of OSMS CBM. Stops any running CBMs, so further ATMS Scan Reversals wouldn't occur as scheduled automatically.
17:01Z (Approx.): Ground commanded stop of OSMS CBM
17:02Z CSM continues execution nominally

17:45:12Z: ATMS Scan Reversal will not be executed at 70deg S. Lat.

SVL 31658 (18:35Z - 18:46Z)
18:39Z Backout the OSMS CBM and reconfigure spacecraft to nominal
18:45Z: Approximate time for ground commanded activation of dual ATMS scan reversal CBM, and may not be at pre-determined latitude. Subject to miss reversal during this orbit.

19:35Z: Approximate time for 2nd ATMS scan reversal during orbit 31658, and may not be at pre-determined latitude. Subject to miss reversal during this orbit.

SVL 31659 (20:18Z - 20:30Z)
20:21Z: Approximate time for ground commanded activation of dual ATMS scan reversal CBM, and may not be at pre-determined latitude. Subject to miss reversal during this orbit.

21:10Z Approximate time for 2nd ATMS scan reversal during orbit 31659, and may not be at pre-determined latitude. Subject to miss reversal during this orbit.

21:58:58Z: Nominal 3-orbit ATMS Scan Reversal cadence resumes when ATMS Scan Reversal CBM activated from on-board CSM

ESPCOperations@noaa.gov at (301)817-4799.

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

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) 817-4799. Please note: it may take up to two business days to process your unsubscribe request.