Subject: ESPC Notification (TRMM Data Outage) UPDATE #2 This is a multi-part message in MIME format. --------------020804090808060605080508 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit *UPDATE: *ESPC has been informed: We no longer expect any unusual geolocation errors in our real-time products tonight and tomorrow for Jan. 1 UTC 2009. We unexpectedly TODAY received an orbit ephemeris file that will work with our geolocation software properly following this evening's leap second passage (at 00:00 UT or O h GMT, i.e. 7:00 p.m. Eastern Standard Time here at GSFC). We don't expect any further updates on this, but will let you know if we get other relevant information. NASA Goddard Space Flight Center * *ESPC has been informed: We still expect 7 km geolocation errors in real-time products for this coming New Year's Day due to the leap second. The problem will now be fixed after about 14 hours, with the delivery of an adjusted ephemeris file on the morning of January 1st (around 8:30 a.m. Eastern Standard Time, or about 13:30 UTC time), presuming everything works as expected. All the data time tags should be fine, however the pixel locations will be shifted about 7 kilometers ahead along-track after 00:00:00 UT Jan 1 and until the new ephemeris delivery. We have not heard of any significant impact that this projected geolocation error will have on any real-time users given this advanced notice. (Please let us know if you believe otherwise.) We cannot be certain that other system problems may affect our real-time production, especially since other problems were encountered at the last leap-second event 3 years ago. However we have done the best we can to assure our readiness, and will review the system performance later on January 1st. As noted previously, this error will not affect the normal production data for this period, which will be released on January 2nd. If you have any questions, let us know. *Details of the Outage: *We will be temporarily suspending TRMM data production from Wednesday December 31, 2008 to Friday January 02, 2008 to allow for quality assurance of data products after we implement leap second adjustments. After PPS production is complete on December. 31, we will shut down PPS production systems. Verification checks will be performed on products to assure that this year's leap second is implemented correctly with L0 and ephemeris inputs for TRMM products. We plan to resume production on Friday January 02, 2009 after our checks are complete. Real time users need to be aware that products generated starting on January 01, 2009 00:00 Universal Time (7:00 p.m. December 31, 2008 in Eastern Standard Time) are expected to have some geolocation errors of about 7 km (about1/2 a pixel in the high resolution channels). This results from our software requiring a special version of the ephemeris file to properly handle the leap second, and constraints with the automated delivery of ephemeris files to us and the TRMM Mission Operations Center (MOC). The real time geolocation error is expected to be corrected after approximately 12 hours into the new year, with the delivery of a special ephemeris file on the morning of Thursday January 01, 2009 EST from the Flight Dynamics System support. We appreciate your patience during this period. Please let us know if you have any questions. Best Regards, Helpdesk ********************************************************** * PPS Helpdesk * * NASA/GSFC Code 610.2 Greenbelt, MD 20771 * * email: helpdesk@pps-mail.nascom.nasa.gov * * Voice: 301-614-5184 FAX: 301-614-5575 * ********************************************************** *Data Affected by the Outage: * TRMM (Tropical Rainfall Monitoring Mission) Data *Date and Time of the Outage: * 12/31/2008 *Length of the Outage: * 12/31/2008, until 01/02/2009 *Contact Point for Questions: ESPC Operations OCL (Operations Crew Leader), 301-817-3880 * --------------020804090808060605080508 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit UPDATE:

ESPC has been informed:
 
We no longer expect any unusual geolocation errors in our
real-time products tonight and tomorrow for Jan. 1 UTC 2009.
We unexpectedly TODAY received an orbit ephemeris file that
will work with our geolocation software properly following this
evening's leap second passage (at 00:00 UT or O h GMT,
i.e. 7:00 p.m. Eastern Standard Time here at GSFC).
 
We don't expect any further updates on this, but will
let you know if we get other relevant information.

NASA Goddard Space Flight Center
 

ESPC has been informed:
We still expect 7 km geolocation errors in real-time products
for this coming New Year's Day due to the leap second. The
problem will now be fixed after about 14 hours, with the delivery
of an adjusted ephemeris file on the morning of January
1st
(around 8:30 a.m. Eastern Standard Time, or about 13:30 UTC time),
presuming everything works as expected.  All the data time tags
should be fine, however the pixel locations will be shifted
about 7 kilometers ahead along-track after 00:00:00 UT Jan 1
and until the new ephemeris delivery.

We have not heard of any significant impact that this projected
geolocation error will have on any real-time users given this
advanced notice.  (Please let us know if you believe otherwise.)

We cannot be certain that other system problems may affect
our real-time production, especially since other problems were
encountered at the last leap-second event 3 years ago.
However we have done the best we can to assure our readiness,
and will review the system performance later on January 1st.

As noted previously, this error will not affect the normal
production data for this period, which will be released on
January 2nd.  If you have any questions, let us know.

Details of the Outage:

We will be temporarily suspending TRMM data production from Wednesday December 31, 2008 to
Friday January 02, 2008 to allow for quality assurance of data products after
we implement leap second adjustments.

After PPS production is complete on December. 31, we will shut down PPS production systems.
Verification checks will be performed on products to assure that this year's leap second is implemented
correctly with L0 and ephemeris inputs for TRMM products.  We plan to resume production on
Friday January 02, 2009 after our checks are complete.

Real time users need to be aware that products generated starting on January 01, 2009 00:00
Universal Time (7:00 p.m. December 31, 2008 in Eastern Standard Time) are expected to have
some geolocation errors of about 7 km (about1/2 a pixel in the high resolution channels). This results
from our software requiring a special version of the ephemeris file to properly handle the leap second,
and constraints with the automated delivery of ephemeris files to us and the
TRMM Mission Operations Center (MOC).  The real time geolocation error is
expected to be corrected after approximately 12 hours into the new year, with the delivery
of a special ephemeris file on the morning of Thursday January 01, 2009 EST
from the Flight Dynamics System support.

We appreciate your patience during this period.   Please let us know if you have any questions.

Best Regards,
Helpdesk


**********************************************************
*   PPS Helpdesk                    &nbs *
*   NASA/GSFC Code 610.2 Greenbelt, MD  20771            *
*   email: helpdesk@pps-mail.nascom.nasa.gov       &nbs *
*   Voice: 301-614-5184               FAX: 301-614-5575  *
**********************************************************

Data Affected by the Outage:
 

TRMM (Tropical Rainfall Monitoring Mission)  Data


Date and Time of the Outage:
 
12/31/2008

Length of the Outage:
 
12/31/2008,  until 01/02/2009

Contact Point for Questions:
ESPC Operations  OCL  (Operations Crew Leader),  301-817-3880

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