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SEAWIFS
Dec 23, 2010
From: gene carl feldman [mailto:gene@seawifs.gsfc.nasa.gov]
To: ocean-color@seawifs.gsfc.nasa.gov
Folks,
At the risk of sounding a bit like Scrooge or perhaps the Grinch who stole Christmas, I am sorry to have to report that for the past two weeks, SeaWiFS has not been collecting data.
We had hoped that the underlying cause of the problem would have been identified and corrected by now but unfortunately, this situation is unlike any that has been seen before and despite the best efforts of GeoEYE, the spacecraft has not responded to their attempts to restore it to routine operations so far. I don't imagine that there will be much change to the situation over the next week but if there is, I will be sure to send out an updated status report as soon as I have any additional information. I really feel badly about dropping this lump of coal in everyone's Christmas stocking but I wanted to get a status out to everyone before people started to disappear for the holidays. On behalf of everyone in our little group here at NASA/Goddard, we wish you all the very best for a happy and healthy New Year.
gene
SEAWIFS
Dec 14, 2010
Orbview-2 is executing it's SafeHaven schedule. An investigation into the cause is underway. No estimate for return to service is available.
SEAWIFS
Sept 7, 2010
Seawifs is back online
SEAWIFS
Sept 1, 2010
OV-2 (SeaWiFS) is in Safe Haven. GeoEye is planning to switch to the backup momentum wheel, based on possible issues with the primary wheel. Data collection is planned to resume at the end of the week.
SEAWIFS
July 13, 2010
From: gene carl feldman [mailto:gene@seawifs.gsfc.nasa.gov]
Sent: Tuesday, July 13, 2010 4:06 AM
To: ocean-color@seawifs.gsfc.nasa.gov
Subject: [ocean-color] seawifs is back after a successful orbit raising campaign
good morning,
it's a pleasure to let everyone know that after much planning, some great teamwork on the part of all the folks involved and thirteen burns, seawifs is now happily orbiting the earth from it's new altitude of 781.5 kilometers. this orbit raising along with a very slight change in the inclination has not only stopped the rapidly accelerating drift of the spacecraft into the afternoon (it is now crossing the equator at approximately 2:20 pm local time) but has reversed that drift and the spacecraft will now gradually return to an orbit with a crossing time closer to 12:20 pm. the seawifs instrument resumed routine operations last night and we received our first downlink and the data look fine. we will be looking closely at the data to see what, if any change there might be due to the change in orbit but we don't anticipate anything major.
seawifs will be celebrating the 13th anniversary of it's launch on august 1, 1997 this year so rather than a cake with thirteen candles, perhaps it is appropriate that it required 13 burns to put it back into an orbit that will allow it to continue collecting this unprecedented record of our changing earth.
best regards,
gene
SEAWIFS
June 26, 2010
From: gene carl feldman [mailto:gene@seawifs.gsfc.nasa.gov]
Sent: Monday, June 28, 2010 4:36 AM
To: ocean-color@seawifs.gsfc.nasa.gov
Cc: obpg-notify@seawifs.gsfc.nasa.gov
Subject: [ocean-color] seawifs orbit raising maneuver has begun
good morning,
as of yesterday afternoon, the seawifs instrument has been powered down and stowed in preparation for the planned orbit raising maneuver which if all goes according to plan, will be carried out over the next two weeks. during that time, there will be NO seawifs data collected. we will keep you posted as to the status of the maneuver and any changes in the schedule.
regards,
gene
SEAWIFS
March 12, 2010
From: Fred Patt [mailto:frederick.s.patt@nasa.gov]
Sent: Friday, March 12, 2010 12:32 PM
To: ocean-color@seawifs.gsfc.nasa.gov; Ocean Color Project Staff
Subject: [ocean-color] SeaWiFS GPS outage
Good afternoon,
The SeaWiFS data have been affected by a GPS outage on the OV-2 spacecraft starting on February 24. Navigation has been affected by accumulated orbit and time code errors. GPS tracking is expected to be restored later this month. As for past outages, there is a high likelihood that navigation accuracy will be recovered after the fact for most of the affected data. In the meantime, navigation from this period should be considered suspect.
Fred Patt
SEAWIFS
November 8, 2009
SeaWiFS is back online.
SEAWIFS
August 30, 2009
SeaWiFS entered safe haven on August 30th, 2009.
Currently there is no estimate on when imaging will resume.
SEAWIFS
July 2, 2009
Seawifs images are coming in again.
SEAWIFS
May 21, 2009
From: Fred Patt [mailto:frederick.s.patt@nasa.gov]
Sent: Thursday, May 21, 2009 1:19 PM
To: ocean-color@seawifs.gsfc.nasa.gov; Ocean Color Project Staff
Subject: Re: OV-2 Recovery
The resumption of SeaWiFS imaging has been delayed by one day.
Regards,
Fred Patt
SEAWIFS
May 20, 2009
From: Fred Patt [mailto:frederick.s.patt@nasa.gov]
Sent: Wednesday, May 20, 2009 1:25 PM
To: ocean-color@seawifs.gsfc.nasa.gov; Ocean Color Project Staff
Subject: [ocean-color] OV-2 Recovery
Good afternoon,
The recovery of OV-2 and the resumption of SeaWiFS imaging was planned for this week and has proceeded according to plan. GeoEye was able to power-cycle the spacecraft computer, which has resolved the onboard timing problem. Some work remains, but the plan is to resume SeaWiFS imaging late tomorrow (Thursday) with a data downlink early Friday morning.
Regards,
Fred Patt
SEAWIFS
May 8, 2009
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Friday, May 08, 2009 6:08 AM
To: obpg-notify@seawifs.gsfc.nasa.gov; ocean-color@seawifs.gsfc.nasa.gov
Subject: [ocean-color] current status of modis/aqua and seawifs data sources
folks,
a quick update on the situation regarding seawifs and modis/aqua data. unfortunately, seawifs is still in safehold meaning that no data is being collected although all indications are that the spacecraft and instrument are fine. geoeye is working on a plan to restore normal operations but as yet, there is no schedule that i have seen for when this will be likely to happen. as for modis/aqua, although we are finally receiving the source data on a fairly regular basis again after a few weeks of difficulty with the provider of the data, we are not as yet receiving the predicted attitude and ephemeris files that are only required for the near real-time processing. consequently, we have to wait until we receive the definitive att/eph files which means that the data may be up to 24 hours old before they are processed. we have been assured that they are working on the problem but as yet, there is no answer as to when that will be. hopefully, things will improve shortly because this has been a real drag.
regards,
gene
SEAWIFS
January 12, 2009
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Monday, January 12, 2009 4:28 AM
To: ocean-color@seawifs.gsfc.nasa.gov
Subject: [ocean-color] RESOLVED - SeaWiFS Flight Data Recorder Anomaly]
Good mroning,
I am very happy to report that as of last night, GeoEYE was able to
restore the SeaWiFS flight data recorder that was giving problems and
that we are once again receiving the full GAC and LAC data stream.
Preliminary indications are that all things are back to normal - a
nice way to start the week.
Best regards,
gene
SEAWIFS
January 10, 2009
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
To: ocean-color@seawifs.gsfc.nasa.gov; staff
Subject: [ocean-color] SeaWiFS Flight Data Recorder Anomaly
Good morning,
Just wanted everyone to know that following the recovery from a very
brief safe haven event this past Wednesday, there appears to be an
anomaly involving one of the two flight data recorders that is used to
record and subsequently transmit the SeaWiFS GAC data. GeoEYE made
one attempt yesterday to reinitialize the recorders but unfortunately,
it did not produce the desired effect. We have been able to verify
that the instrument is still collecting both LAC and GAC data so
hopefully, once the problem with the GAC recorder is identified, a
strategy to return things to routine operations will be found. We'll
keep you posted with any news as we have it.
Best regards,
gene
SEAWIFS
October 06, 2008
From: Fred Patt [mailto:frederick.s.patt@nasa.gov]
Sent: Monday, October 06, 2008 5:56 AM
To: ocean-color@seawifs.gsfc.nasa.gov
Subject: [ocean-color] SeaWiFS data outage
Good morning,
I'm sure many of you noticed the gap in SeaWiFS data collection last
week.
The OrbView-2 spacecraft experienced a reset of one of the onboard
computer processors on Tuesday afternoon. This type of event has not
been unusual in the past, and the recovery is generally routine.
Because of the unusual events during the past year, GeoEye took
additional steps (and time) to verify the spacecraft systems following
the reset.
The data outage was from about 18:22 on Day 274 (September
30) to 21:52 on Day
277 (October 3). Spacecraft and instrument performance have been
nominal since data collection was restarted.
Regards,
Fred Patt
SEAWIFS
July 2, 2008
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Wednesday, July 02, 2008 12:23 PM
Good afternoon, As many of you have probably noticed, our collection of SeaWiFS data has been anything but routine ever since the first of the year and recently, there have been a number of more frequent data outages. While this is certainly not good news, I can report that the instrument and spacecraft systems appear to be in good shape and that it is believed that the problem can hopefully be fixed through a series of patches to the spacecraft software.
Additionally, I am happy to say that GeoEye (the spacecraft operator) is actively working with Orbital Sciences Corporation (the spacecraft builder) to both identify and hopefully, correct the problem that we have been experiencing. At the present time the spacecraft is not in imaging mode but I understand the plan is to resume imaging while the groups work on the more robust solution. As always, I will try and keep you posted with updated and hopefully, positive information as I can.
best regards,
gene
May 1, 2008
From: gene carl feldman
Good morning,
I am happy to report that SeaWiFS has resumed imaging after an approximately one day outage and a downlink was received last night.
There are still some gps/timing-related issues that need to be resolved before it can considered "back to normal" but those are being worked on and hopefully, once the underlying cause is fully understood can be solved.
SEAWIFS
April 30, 2008
From: McKee Angela [mailto:McKee.Angela@geoeye.com]
Subject: OV2 in SafeHaven
Folks,
OrbView-2 experienced an anomaly Monday afternoon (April 28). We are communicating with and have positive control of the satellite. An anomaly investigation is currently underway, and we hope to resolve this problem as quickly as possible.
March 5, 2008
NRL is undergoing changes in hardware and software resulting in modifications in our Aerosol website. Efforts are being made to maintain all the products on the website as before, but in some cases products will be different or unavailable, especially during the transition period over the next few weeks. NAAPS optical depth and visibility forecast plots are also available at FNMOC. Concerns, problems, and suggestions can be reported to the science contact link above.
SEAWIFS
April 7, 2008 - Seawifs is back!
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Tuesday, April 08, 2008 3:10 AM
To: ocean-color@seawifs.gsfc.nasa.gov
Cc: staff@seawifs.gsfc.nasa.gov
Subject: [ocean-color] SeaWiFS Status Message
Folks,
I was waiting for the official announcement from GeoEye before I wanted to give another update and here it is.
Regards,
gene
Dear OrbView-2 SeaWiFS Users,
GeoEye is happy to announce that OV2 returned to imaging service last Friday Afternoon after turning on the SeaWiFs sensor. Imagery was collected throughout the weekend and daily imagery operations are enabled.
Both GAC and HRPT images have been collected and while first looks are promising, there are still details to be refined before we declare everything as normal. The process of certifying both the geometric and radiometric accuracy and validity of the data with NASA is beginning and is likely to continue throughout the month.
We appreciate your patience during this process and we will advise if there is any change in status.
Best Regards,
GeoEye
March 27,2008
From: gene carl feldman [mailto:gene@seawifs.gsfc.nasa.gov]
Sent: Thursday, March 27, 2008 12:31 PM
To: ocean-color@seawifs.gsfc.nasa.gov
Cc: staff@seawifs.gsfc.nasa.gov
Subject: [ocean-color] SeaWiFS Status - quo.
Update as of 27 March 2008:
Work continues on returning SeaWiFS to full imaging mode although a target date for that to happen has not been established. At this time the spacecraft and instrument are fine, the spacecraft power system is normal, GPS tracking has been restored and a series of table updates to the onboard software are being carried out to restore all the parameters to pre-anomaly values. As yet, however, there is no definitive schedule that has been provided for resumption of imaging. Non-critical updates will be posted to the Ocean Color Announcements section on the OceanColor forum as they become available at:
http://oceancolor.gsfc.nasa.gov/forum/oceancolor/forum_show.pl
but any major change in the situation will be sent via e-mail to the oceancolor mailing list.
I'll keep you posted as new developments warrant.
Regards for now,
gene
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Wednesday, March 05, 2008 1:23 PM
To: ocean-color@seawifs.gsfc.nasa.gov
Cc: staff@seawifs.gsfc.nasa.gov
Subject: [ocean-color] seawifs status update
good afternoon,
just wanted to report that the process to restore seawifs to normal operations is underway and that the first, and most critical hurdle
has been overcome. currently, they are in the process of going
through the steps required to return the spacecraft to normal, autonomous operations after which routine imaging operations should resume. because things are being done in a very cautious and conservative manner (as it should be), i don't have a specific schedule to provide as to when we might expect imaging to resume but will keep you posted as soon as we have a target date.
regards,
gene
By @sean Date 2008-02-08 13:27 here is the latest information from geoeye regarding the status for
the planned restoration of routine seawifs imaging operations.
hopefully, we'll have some specific and positive news to pass along
next week. a large, collective crossing of fingers would be most
appreciated.
regards,
gene
Dear OrbView-2 SeaWiFS Users,
GeoEye remains in daily communication with OrbView-2, the satellite
and SeaWiFS sensor are in a safe condition, and we continue to be
optimistic regarding returning OrbView-2 to service.
We continue to make progress on finalizing a recovery plan and will
advise when there is a change in operational status.
We appreciate your patience during this process.
Best Regards,
GeoEye
-----Original Message-----
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Tuesday, January 22, 2008 3:18 PM
To: ocean-color@seawifs.gsfc.nasa.gov
Cc: staff@seawifs.gsfc.nasa.gov
Subject: [ocean-color] seawifs status
good evening,
below is the latest information that has been received from GeoEYE regarding the current situation with seawifs (aka OrbView-2). as always, we will pass along any information as soon as it is available.
regards,
gene
message from GeoEYE:
"On January 1, 2008, beginning with OrbView-2's first imagery collection of the New Year, ancillary data associated with the imagery such as GPS and satellite attitude information stopped being included in the downlink.
As a result the imagery data cannot be geo-positioned, rendering it unusable for scientific research purposes. OrbView-2 has been removed from imaging operations for troubleshooting and diagnostics.
GeoEye remains in daily communication with OrbView-2, the satellite is in a safe condition, and we are optimistic regarding returning OrbView-2 to service.
We have investigated the performance observations and have established a resolution plan. This process, while time-consuming, has been performed using the diligence and thoroughness necessary with an aging satellite.
We are finalizing the specifics of that plan to ensure that our future actions are well-developed to restore the OrbView-2 satellite into operations supporting the mission of the ocean color community with minimal risk.
We anticipate resolving this issue within the next several days, and will let you know as soon as the status changes."
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Wednesday, January 16, 2008 7:05 AM
To: ocean-color@seawifs.gsfc.nasa.gov
Cc: staff@seawifs.gsfc.nasa.gov
Subject: [ocean-color] seawifs status update
good morning,
unfortunately, i have no further news to report on the progress towards bringing seawifs back to normal operations and am not exactly sure as to the specific schedule and the steps that are being taken by the satellite operator (GeoEYE) to recover from this anomaly.
however, i do know that the spacecraft and the seawifs instrument are still healthy and still in the ground-induced safe haven status while telemetry is being monitored and a recovery plan developed. i wish that i had more information to pass along but i guess the best that i can say at this time is that "no news is good news". if anything changes or if i have any new information to pass along, i will do so as soon as i get it.
gene
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----Original Message-----
From: gene carl feldman [mailto:gene.c.feldman@nasa.gov]
Sent: Friday, January 11, 2008 6:22 AM
To: ocean-color@seawifs.gsfc.nasa.gov
Cc: obpg-notify@seawifs.gsfc.nasa.gov; staff@seawifs.gsfc.nasa.gov
Subject: [ocean-color] seawifs status update
good morning,
as of friday morning, seawifs is still in a commanded safe haven condition with all systems healthy. analysis of the available telemetry data has pointed to a potential source of the initial anomaly and a set of diagnostic and subsequent corrective actions are being developed. extra care is being taken to make sure that the solution that is ultimately implemented is the best one for the long-term rather than just a quick fix since we all hope to get many more years of valuable data out of this remarkable little spacecraft.
the important thing to remember is that the initial problem appears to be the result of an onboard "hiccup" in the software which may have had an impact on the handling on the stored attitude control telemetry on the spacecraft and NOT a hardware failure on either the
spacecraft or the seawifs instrument. the fact that the spacecraft
and instrument were still performing exactly as they were supposed to even after the event and that the only indication of a problem was the absence of the telemetry information that was needed for subsequent processing of the data is a very good sign, at least to these non-engineer's mind. my hope is that we will have a better sense of the path ahead and the schedule to accomplish it by early next week. i will keep everyone posted as new information becomes available.
regards for now,
gene
AFWA
Currently we are unable to get data from the AFWA data_links web site.
Data was last downloaded on 2007101418.
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