2000 May 11
Packet Sequence error count 12 for May 10, 2000 LZ data set. Issued instrument reset commands.2000 April 22
TRMM Recorder overflow, (see attached e-mail for deltails). Data Loss: 2000-113T01:04:37.75296 - 2000-113T01:32:42.75365 (lost 1685 secs)2000 April 19
Packet Sequence error count 21 for April 18, 2000 LZ data set. Issued instrument reset commands.2000 March 31
Packet Sequence error count 12 for March 30, 2000 LZ data set. Issued instrument reset commands.2000 March 15
Packet Sequence error count 12 for March 14, 2000 LZ data set. Issued instrument reset commands.2000 February 22
Packet Sequence error count 10 for February 21, 2000 LZ data set. Issued instrument reset commands.2000 February 03
Packet Sequence error count 19 for February 02, 2000 LZ data set. Issued instrument reset commands.2000 January 18
Packet Sequence error count 10 for January 17, 2000 LZ data set. Issued instrument reset commands.2000 January 10
See TSDIS Helpdesk e-mail for explanation for instrument data loss. Data Loss: 2000-010T07:25:49.75333 - 2000-010T07:34:10.75319 (lost 500 secs).1999 December 29
Packet Sequence error count 12 for December 27, 1999 LZ data set. Issued instrument reset commands.1999 December 09
Packet Sequence error count 13 for December 08, 1999 LZ data set. Issued instrument reset commands.1999 November 17
Instrument is to be powered down during the 321/21:23z event for 1999 Leonid Meteor Storm. The planned event for instrument power up is 322/10:31z. Please see Timeline. Actual data outage 1999-11-17T21:25:14 to 1999-11-18T06:53:35.1999 November 03
Packet Sequence error count 11 for November 02, 1999 LZ data set. Issued instrument reset commands.1999 October 15 - 16
LIS HEATER AUTO CONFIG The switch occurred repeatedly, October 15 - 16. TRMMM MOC was requested to perform a normal reset/recovery command sequence whenever this anomaly occurred. Due to the increased frequencey of occurances of the auto switch, the Heater Controller auto select function (12:42:32z) was disabled. See Cancace Shomaker's e-mail. Click here for summary of anomaly and command activity.1999 October 04
TRMM recorder overflow. Data loss: 1999-277T03:50:04.75388 - 1999-277T04:53:59.75284 (lost 3834 secs) See Andy Calloway's e-mail.1999 September 22
LIS HEATER AUTO CONFIG. 1999-265T18:16:13.75313 (Sep 22) [0x0aab/0x0400] Primary heater software OFF 1999-265T18:16:13.75313 (Sep 22) [0x0aab/0x0200] Secondary heater software ON 1999-265T18:16:13.75313 (Sep 22) [0x0aab/0x0040] Primary Heater Hardware status OFF 1999-265T18:16:13.75313 (Sep 22) [0x0aab/0x0020] Secondary Heater Hardware status ON No Amomalous conditions. Issued normal reset commands. LIS returned to nominal operations. 1999-265T21:18:48.04317 (Sep 22) [0x0ccb/0x0400] Primary heater software OFF 1999-265T21:18:48.04317 (Sep 22) [0x0ccb/0x0200] Secondary heater software ON 1999-265T21:18:48.04317 (Sep 22) [0x0ccb/0x0040] Primary Heater Hardware status ON 1999-265T21:18:48.04317 (Sep 22) [0x0ccb/0x0020] Secondary Heater Hardware status OFF1999 September 17
Packet Sequence error count 12 for September 16, 1999 LZ data set. Issued instrument reset commands.1999 August 26
LIS HEATER AUTO CONFIG on August 25, 1999. See Andy Calloway's e-mail. 1999-237T22:12:33.75316 (Aug 25) [0x0aab/0x0400] Primary heater software OFF 1999-237T22:12:33.75316 (Aug 25) [0x0aab/0x0200] Secondary heater software ON 1999-237T22:12:33.75316 (Aug 25) [0x0aab/0x0040] Primary Heater Hardware status OFF 1999-237T22:12:33.75316 (Aug 25) [0x0aab/0x0020] Secondary Heater Hardware status ON The anomaly occurred, (using the latest LIS TLE) not in the SAA but just east of the northern end of the Philippines. Issued instrument reset commands. The command request was executed at the following times: 238/14:34:09z LWDOGEN 238/14:34:31z LGENWDTOUT 238/14:36:14z LTHADJ 238/14:36:53z LBKGSNDON BG8KBPS The primary heater is now ON and the secondary heater OFF. Also, see Delisa Wilkersons e-mail.1999 August 24
Small amount of data loss due to a TRMM recorder overflow on day 236. See FOT e-mail.1999 August 17
Packet Sequence error count 11 for August 16, 1999 LZ data set. Issued instrument reset commands.1999 August 4
Packet Sequence error count 12 for August 3, 1999 LZ data set. Issued instrument reset commands.1999 July 14
Packet Sequence error count 13 for July 13, 1999 LZ data set. Issued instrument reset commands.1999 June 22
Packet Sequence error count 17 for June 21, 1999 LZ data set. Issued instrument reset commands.1999 May 28
Packet Sequence error count 14 for May 27, 1999 LZ data set. Issued instrument reset commands.1999 May 11
Packet Sequence error count 18 for May 10, 1999 LZ data set. Issued instrument reset commands.1999 April 16
Packet Sequence error count 171 for April 15, 1999 LZ data set. Issued instrument reset commands. The LIS telemetry contained many R-S errors, packet sequence errors, and suspect data for almost 3 orbits, (4:38Z - 8:49Z on 04/15/1999). All housekeeping parameters are nominal. Data after this time seems nominal.1999 March 30
Packet Sequence error count 13 for March 29, 1999 LZ data set. Issued instrument reset commands.1999 March 08
Packet Sequence error count 19 for March 06, 1999 LZ data set. Issued instrument reset commands.1999 February 19
Packet Sequence error count 10 for February 18, 1999 LZ data set. Issued instrument reset commands.1999 January 26
Packet Sequence error count 11 for January 25, 1999 LZ data set. Issued instrument reset commands.1999 January 03
At approximately 18:10 GMT on 99-003, the TRMM spacecraft entered Sun Acq and switched to GSACE B due to an FDC trigger, in which the Solar Arrays did not reach their commanded position before the alotted time. All instruments are currently off, until analysis and recovery efforts are complete. A complete timeline of events is being put together and will be distributed once all the information is gathered. We regret the inconvenience, and thank you for your patience. For any specific questions or requests, please contact the TRMM MOC at 301-286-0198. Additional information.1998 December 28
Packet Sequence error count 14 for December 26, 1998 LZ data set. Issued instrument reset commands.1998 December 11
Packet Sequence error count 15 for December 10, 1998 LZ data set. Issued instrument reset commands.1998 November 28
Science production for this day requires use of ephemeris from September 27, 1998. Using normal ephemeris fails.1998 November 17
Leonid activity schedule.1998 November 12
Packet Sequence error count 14 for November 10, 1998 LZ data set. Issued instrument reset commands.1998 October 20
Packet Sequence error count 15 for October 19, 1998 LZ data set. Issued instrument reset commands.1998 September 29
Packet Sequence error count 14 for September 27, 1998 LZ data set. Issued instrument reset commands.1998 September 29
Science production for this day requires use of ephemeris from September 27, 1998. Using normal ephemeris fails.1998 September 28
Packet Sequence error count 14 for September 27, 1998 LZ data set. Issued instrument reset commands.1998 September 28
Packet Sequence error count 14 for September 27, 1998 LZ data set. Issued instrument reset commands.1998 September 9
Packet Sequence error count 12 for September 08, 1998 LZ data set. Issued instrument reset commands.1998 August 20
Packet Sequence error count 14 for August 19, 1998 LZ data set. Issued instrument reset commands.1998 July 29
Packet Sequence error count 16 for July 28, 1998 LZ data set. Issued instrument reset commands.1998 July 07
Packet Sequence error count 79 for July 05, 1998 LZ data set. Issued instrument reset commands. This data set was received late due to network outage.1998 June 08
Packet Sequence error count 14 for June 07, 1998 LZ data set. Issued instrument reset commands.1998 May 19
Packet Sequence error count 14 for May 18, 1998 LZ data set. Issued instrument reset commands.1998 April 25
Andy Calloway e-mail about Sun_Acq Mode / Low Power Recovery.1998 April 22
Andy Calloway e-mail about lost VCDUs1998 April 15
Packet Sequence error count 15 for April 14, 1998 LZ data set. Issued instrument reset commands.1998 March 27
Packet Sequence error count 61 for March 36, 1998 LZ data set. Issued instrument reset commands.1998 March 3-4
DAY 062/063 LOW POWER RECOVERY TIMELINE.1998 February 10
More threshold tweaking to get rid of false daytime events due to cloud edge. 1998-041T16:56:16.42807 :: 16 16 18 18 18 18 18 20 20 20 20 20 22 63 63 63 Also did a watchdog timeout to be safe, since the packet sequence errors are increasing again, (peak 6/LZ data set).1998 January 23
There has been an increase in packet sequence errors which has resulted in some small data loss and some small amount of data corruption,(see chart below). Each error typically represents a loss of two data packets and sometimes the corruption of one. Another funny is that we are still receiving the maximum # of packets possible 86400/day, even with the packet loss?? Peak errors/day so far is 117. The sequence errors are represented by the lower line on the chart using the left axis. The rise in data sequence errors started when TRMM re-entered the glint zone, ( i.e. glint started traversing the CCD). This did not occur when LIS was in the 6 Kb mode. LIS went to 8kb mode at 1997-12-14T22:46:12. This is indicated by the step in the # packets/day. The near term solution is to monitor errors and reset if errors are greater than 10/LZ data set, until a long term solution is developed.
1997 December 19
Thresholds changed due to small could edge Still creating false events. 1997-353T22:31:46.07794 :: 14 14 18 18 18 18 18 18 20 20 20 20 22 63 63 631997 December 18
Thresholds changed due to small could edge creating large # false events. 1997-352T19:01:28.16108 :: 14 14 17 17 17 17 18 18 19 19 19 19 20 63 63 631997 December 15
Thresholds changed to improve performance. 1997-349T22:46:10.86602 :: 14 14 16 16 16 16 17 17 18 18 18 18 20 63 63 63 Data rate changed to get more backgrounds. 1997-349T22:45:19.24807 [0x8101/0x1111] executed on 1st attempt = (Background send mode on (8kbs))Temperatures before power on.
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