SORCE Weekly Status Report – 10/23/2003 to 10/29/2003

 

 

1.  Introduction

 

This status report addresses the performance of the SORCE spacecraft, instruments, and ground assets during the week of Thursday, October 23 through Wednesday, October 29, 2003.

 

 

2.  Spacecraft Summary   (submitted by Sean Ryan  10/30/03)

 

 

10/22

10/23

10/24

10/25

10/26

10/27

10/28

295

296

297

298

299

300

301

 

All subsystems are nominal

 

SC clock was adjusted by 0.2 seconds on day 297.

 

The MU reported 2 read “0” events in the last week:

03/295-14:23:52

03/298-15:06:06

 

            GCI lockups:                                                                  (MINUTES)

Instrument     Start             End             Duration    Lat      Lon

solstice_a 2003/295-22:52:18 2003/295-23:00:08       7.83    -26.6     13.8

solstice_a 2003/296-10:39:13 2003/296-11:57:51      78.63    -22.2    -51.9

solstice_a 2003/298-02:42:57 2003/298-02:51:06       8.15    -30.7    -49.5

solstice_a 2003/300-05:10:06 2003/300-06:42:30      92.40    -36.8    -28.2

solstice_a 2003/301-03:44:20 2003/301-03:46:43       2.38    -40.0    -39.6

solstice_a 2003/301-05:26:09 2003/301-07:01:15      95.10    -37.9    -43.4

solstice_b 2003/296-07:10:16 2003/296-08:43:20      93.07    -40.0    -60.2

solstice_b 2003/299-06:33:24 2003/299-08:01:06      87.70    -32.5    -29.2

solstice_b 2003/301-00:17:33 2003/301-00:32:08      14.58    -26.7    -40.2

sim_a      2003/295-06:52:01 2003/295-08:24:47      92.77    -39.8    -54.3

sim_a      2003/296-05:33:48 2003/296-07:05:47      91.98    -40.0    -32.5

sim_a      2003/298-01:05:26 2003/298-01:13:28       8.03    -30.1    -26.1

sim_a      2003/299-03:03:06 2003/299-03:09:04       5.97    -35.3    -48.7

sim_a      2003/299-06:28:09 2003/299-08:00:46      92.62    -38.7    -51.0

sim_b      2003/295-06:51:03 2003/295-08:24:52      93.82    -39.5    -58.9

sim_b      2003/295-10:25:02 2003/295-11:39:18      74.27    -15.9    -32.6

sim_b      2003/296-10:41:48 2003/296-11:57:31      75.72    -16.8    -44.6

sim_b      2003/298-09:33:59 2003/298-10:56:53      82.90    -26.9    -56.3

sim_b      2003/299-09:54:36 2003/299-11:15:19      80.72    -19.5    -55.9

sim_b      2003/300-06:53:29 2003/300-08:19:24      85.92    -27.5    -29.7

tim        2003/296-00:25:45 2003/296-00:37:26      11.68    -19.2    -22.1

tim        2003/296-09:00:15 2003/296-10:20:43      80.47    -25.9    -33.1

tim        2003/299-06:24:29 2003/299-08:01:17      96.80    -40.0    -67.4

tim        2003/300-08:32:49 2003/300-09:57:04      84.25    -23.2    -47.3

tim        2003/301-01:55:57 2003/301-02:09:33      13.60    -28.9    -60.9

XPS        2003/295-05:03:00                                 -25.0    -76.9

XPS        2003/295-08:33:12                                 -39.2    -60.8

XPS        2003/296-03:44:19                                 -27.7    -58.4

XPS        2003/301-00:18:12                                 -27.9    -38.0

XPS        2003/301-05:20:01                                 -39.8    -71.0

XPS        2003/301-22:55:58                                 -23.6    -31.4

 

 

SIM A

SIM B

SOL A

SOL B

TIM

XPS*

Week

5

6

6

3

5

6

Total

159

218

124

133

215

180

 

 

 

3.  Ground Support / Contact Summary  (submitted by Sean Ryan  10/30/03)

 

14 ground contacts were performed over the past week

1 TDRS contact was performed in the past week

            The TDRS contact was required to clear datasets, and prevent data loss

 

 

Captured

VCDUS

Recorded

VCDUS

%

SC housekeeping

317917

317917

100

IM housekeeping

52130

52130

100

Science

339919

339919

100

 

 

 

4.  Instrument Status

 

4.1.      TIM      (submitted by Greg Kopp  10/30/03)

 

TIM Current Work

Data including more accurate dark correction and Traveler-based linearity correction have been released.

-          New results average 0.2 W/m2 higher than before.

 

TIM Operations During Previous Week

·               Normal Ops (TSI data w/Cone B)

·               Weekly Cone A & B comparison

·               Bi-weekly Gain AB calibration

 

TIM Anomalies During Previous Week

None.

 

 

4.2.               SIM     (submitted by Jerry Harder  10/30/03)

 

Summary:

Instrument was planned to be in normal mode of operation:

·               ESR Table scans (High and Low scripts)

·               24-min scans

·               Servo gain calibrations

·               Prism transmission calibration modes

·               Cruciform alignments

·               CCD image light and image dark

·               Fixed wavelength

·               IR scans

·               SIM cold temperature

 

SIM Activities:

·                     Planning of new table scan mode complete will commence next week.

·                     With the slower shutter cycle and longer intergration times for the new SIM table scans, we will revisit the early orbit experiments to study the ESR PID coefficients.  This exercise will be done on SIM B so it will not disrupt the collection of Science data.

 

SIM Anomalous Behavior:

None to report.  The solar flare activity of this week did not adversely affect SIM operations.  The SIM cold test performed as scheduled, but SIM did not cool to the low set point of 11 C.  Minimum SIM temperature reached 13 C.  The data is still useable but will require more careful analysis.

 

SIM Plans for Next Week:

·                     Normal ops with start of modified ESR table scans.

 

 

4.3.      SOLSTICE    (submitted by Bill McClintock   10/30/03)

 

SOLSTICE Operations:

Normal Solar-Stellar operations continue. Solar FOV maps and additional Stellar Alignments were completed last week.  A large solar flare that erupted on 10/28 was seen in Hi, SiIII, and MgII.

 

SOLSTICE Current Status:

Marty Snow showed that at least half of the variation in stellar zero order positions was caused by ephemeris errors that have been eliminated by the use of J2000 coordinates.  He has begun work on the solar alignment data and has evaluated the first solar occultation experiments. Software to detect and correct grating drive induced wavelength shifts has been completed and placed on line.  Bill McClintock has evaluating the resulting data products and discovered that the algorithm requires a better reference spectrum.  We continue to develop scattered light algorithms as the last step in completing the SOLSTICE data processing pipeline.

 

 

4.4.      XPS    (submitted by Tom Woods   10/30/03)

 

XPS Summary

XPS made several normal solar observations this past week.  The Sun has been very active the past two weeks, and XPS has recorded several flares since day 2003/292.  XPS was observing during the rise and fall of the extremely large X-17 flare on day 2003/301.  This large flare increased by a factor of 25 in the XUV and by a factor of 2 at Lyman-alpha.

 

XPS Calibration Status

No new issues.

 

XPS Anomalous Behavior

XPS had 5 anomalous GCI errors last week, but they did not affect instrument operations.

 

XPS General Concerns:

No new issues.

 

 

5.  Plans Completed This Week   (submitted by Jay Kominek 10/30/03)

 

SORCE Spacecraft

Activity                                     Total                            Total Time

Solar Rolls                                 398                                  10:55

Stellar Rolls                               405                                    8:10

Ram Avoidance                              0                                    0:00

Solar Alignment                             0                                    0:00

Stellar Alignment                            0                                    0:00

Field Of View Maps                        0                                    0:00

FSS Calibration                              0                                    0:00

Station Contacts                          14                                    3:11

GCI Checks                               522                                    0:08

State Vector Upload                       7                                    0:21

MU Checksum                               1                                    0:12

 

SIM A (Primary)

Solar Activity                           Total                            Total Time

ESR Mode                                   11                                    7:14

ESR Mode with HRT                     52                                  33:26

IR Scan                                         6                                    6:28

Quick Scan                                  11                                    4:27

Quick Scan HRT                          99                                  38:21

Calibration Activity

Fixed Wavelength                           5                                    5:16

Servo Gain Calibration                    2                                    1:20

Solar Alignment                             2                                    1:28

Field Of View Map                          0                                    0:00

Prism Calibration                            8                                    9:27

Image Light                                    2                                    0:10

Image Dark                                    2                                    0:10

ESR Full Scan                               7                                    5:06

Dark                                          206                                    2:28

Special Activity

Power Cycle Checks                   105                                    4:51

 

SIM B (Secondary)

Solar Activity                           Total                            Total Time

ESR Mode                                     0                                    0:00

ESR Mode with HRT                       0                                    0:00

IR Scan                                         0                                    0:00

Quick Scan                                   0                                    0:00

Quick Scan HRT                          35                                  14:09

Calibration Activity

Fixed Wavelength                           0                                    0:00

Servo Gain Calibration                    2                                    1:20

Solar Alignment                             2                                    1:28

Field Of View Map                          0                                    0:00

Prism Calibration                            8                                    9:13

Image Light                                    2                                    0:10

Image Dark                                    2                                    0:10

ESR Full Scan                               7                                    5:06

Dark                                            72                                    1:17

Special Activity

Power Cycle Checks                   105                                    4:45

 

SOLSTICE A (MUV)

Solar Activity                         Total                         Total Time

Normal Scan                                90                                  77:14

Quick Scan                                  34                                    9:39

Mini Quick Scan                           35                                    9:52

Stellar Activity

Fixed Wavelength                       339                                  20:24

Companion                                 150                                    8:41

Stellar Scan                                   2                                    0:20

Zero Order Scan                         308                                    6:24

Number Unique Targets                 30                                  36:25

Calibration Activity

Filter Calibration                             7                                    7:38

Fixed Wavelength                           0                                    0:00

AB Comparison                              1                                    0:53

Mini 64 Seam                                7                                    7:39

MUV Solar Alignment                     1                                    0:44

FUV Solar Alignment                      1                                    0:44

MUV Field Of View Map                  0                                    0:00

FUV Field of View Map                   0                                    0:00

Special Activity

Power Cycle Checks                   105                                    4:11

Step Response Test                       1                                    0:02

 

SOLSTICE B (FUV)

Solar Activity                           Total                            Total Time

Normal Scan                                97                                  89:48

Quick Scan                                  41                                    7:48

Mini Quick Scan                           35                                    6:47

Stellar Activity

Fixed Wavelength                       339                                  20:23

Companion                                 150                                    8:40

Stellar Scan                                   2                                    0:20

Zero Order Scan                         308                                    6:26

Number Unique Targets                 30                                  36:23

Calibration Activity

Fixed Wavelength                           0                                    0:00

AB Comparison                              1                                    0:53

Mini 64 Seam                                7                                    7:39

MUV Solar Alignment                     1                                    0:44

FUV Solar Alignment                      1                                    0:44

MUV Field Of View Map                  0                                    0:00

FUV Field of View Map                   0                                    0:00

Special Activity

Power Cycle Checks                   105                                    4:19

Step Response Test                       1                                    0:02

 

TIM

Solar Activity                         Total                         Total Time

Normal Solar                              100                                112:23

Normal Eclipse                           100                                  48:02

Calibration Activity

Degradation A                                1                                    1:05

Degradation C                                0                                    0:00

Aliveness D                                   0                                    0:00

Gain Calibration AB                        1                                    6:00

Gain Calibration CD                        0                                    0:00

Solar Alignment                             2                                    1:28

Field Of View Map                          0                                    0:00

Special Activity

Power Cycle Checks                   102                                    3:55

 

XPS

Solar Activity                         Total                         Total Time

Normal Solar                              103                                111:47

Calibration Activity

Calibration                                     1                                    1:02

Solar Alignment                             2                                    1:28

Field Of View Map                          0                                    0:00

 

 

6.  Data Processing Summary   (submitted by Chris Pankratz   10/30/03)

 

6.1.            General

Efforts this week have focused on the following activities:

1.      SOLSTICE Level 3 software development

2.      Reprocessing SOLSTICE data. 

3.      Delivery of new TIM TSI data

4.      Reprocessing SIM data

 

6.2.      TIM

·                     Reprocessing of TIM data with the new Dark and Linearity corrections has finished. 

·                     New SORCE Total Solar Irradiance data products have been delivered to the DAAC, and are also available from the SORCE web site (http://lasp.colorado.edu/sorce/data_access.html).  These data have a version number of 1, and contain a new dark correction algorithm which accounts for instrument day/night thermal differences, as well as a linearity correction to the applied ESR power.  Data have been released from 25 Feb 2003 through 15 October 2003.

 

6.3.      SOLSTICE

·                     SOLSTICE MUV Data are being reprocessed following resolution of the previously-reported problem with the application of the exit-plane filter transmission

·                     A few software bug fixes are being made to improve the robustness of the data processing software.

·                     Examination of science products is underway to verify the quality and correctness of the data.

·                     Examination of wavelength shift results continues, in an effort to better understand the behavior of the SOLSTICE instruments, and to verify the quality of the data that are now being produced by the science processing system.

·                     Software to produce daily and 6-hourly (Level 3) spectra continues is nearing completion.  The software is now being tested and readied for release.

·                     Work continues on stellar-based instrument degradation analysis, generating updated scattered light calibration data, processing of in-flight field-of-view maps.

 

6.4.      SIM

·                     SIM reprocessing activities have completed.

·                     Work continues on determining SIM instrument degradation, which is chiefly associated with time-dependent changes in the transmission of the SIM prism.  A preliminary calibration should be ready for review shortly.

·                     Work is underway to improve the performance of the SIM processing.  At present, some computationally expensive intermediate results are unnecessarily recomputed each processing day.  These optimizations will obviate the need for these extra computations and should improve performance considerably.

 

6.5.      XPS

·                     Nominal data processing activities