GOMOS Daily Reports

This report presents the daily analysis on parameters extracted from GOMOS level 1b data (GOM_TRA_1P).
It is intended to monitor some important parameters that will impact the quality of the level 2 products
as the Spectrometers and Photometers CCD Temperatures and Dark Charge, SATU noise equivalent angle...
A list of level 0 products (and content) that have arrived during the actual month to the PCF is also given.

Item	Value
Time of report generation	27OCT2006 07:33:36
Data source version	GOMOS/5.00
Start time of products	QDS_YESTERDAY(/START)-1D (25OCT2006 00:00:00)
Stop time of products	QDS_YESTERDAY(/STOP)-1D (26OCT2006 00:00:00)
Store outputs in DB	Yes
Nb of level 1b prods	19
Nb of prods with errors	2

2. Summary of products arrived in PCF (Product Control Facility)

2.1 Level 0 products arrived in PCF (see template here)

2.2 Summary of processed GOM_TRA_1P products

Nr	Filename	UTC Start time	Limb	Duration	Star Id	Star Name	Star Mag	Star Temp	Nb Meas	Orbit	Prod. error
1	GOM_TRA_1PNPDE20061025_000536_000000362052_00216_24318_1704.N1	25-OCT-2006 00:05:36	Dark	35.500	113	Mu Vel	2.6920	5000.0	71	24318	No
2	GOM_TRA_1PNPDE20061025_000724_000000472052_00216_24318_1705.N1	25-OCT-2006 00:07:24	Dark	47.000	65	Lam Vel	2.2040	4400.0	94	24318	No
3	GOM_TRA_1PNPDE20061025_001016_000000342052_00217_24319_1706.N1	25-OCT-2006 00:10:16	Dark	34.000	46	Del Vel	1.9540	10600.	68	24319	No
4	GOM_TRA_1PNPDE20061025_001203_000000322052_00217_24319_1707.N1	25-OCT-2006 00:12:03	Dark	31.500	29	Bet Car	1.6720	10200.	63	24319	No
5	GOM_TRA_1PNPDE20061025_003553_000000382052_00217_24319_1692.N1	25-OCT-2006 00:35:53	Straylight	37.500	52	16Bet Cet	2.0370	4500.0	75	24319	No
6	GOM_TRA_1PNPDE20061025_004522_000000302052_00217_24319_1693.N1	25-OCT-2006 00:45:22	Bright	30.000	140	88Gam Peg	2.8340	26000.	60	24319	Yes
7	GOM_TRA_1PNPDE20061025_004915_000000312052_00217_24319_1694.N1	25-OCT-2006 00:49:15	Bright	30.500	58	21Alp And	2.0730	11000.	61	24319	No
8	GOM_TRA_1PNPDE20061025_021629_000000362052_00218_24320_1693.N1	25-OCT-2006 02:16:29	Straylight	35.500	52	16Bet Cet	2.0370	4500.0	71	24320	No
9	GOM_TRA_1PNPDE20061025_022558_000000292052_00218_24320_1694.N1	25-OCT-2006 02:25:58	Bright	29.000	140	88Gam Peg	2.8340	26000.	58	24320	No
10	GOM_TRA_1PNPDE20061025_022951_000000312052_00218_24320_1695.N1	25-OCT-2006 02:29:51	Bright	30.500	58	21Alp And	2.0730	11000.	61	24320	No
11	GOM_TRA_1PNPDE20061025_023146_000000352052_00218_24320_1696.N1	25-OCT-2006 02:31:46	Bright	34.500	53	43Bet And	2.0480	3300.0	69	24320	No
12	GOM_TRA_1PNPDE20061025_023732_000000292052_00218_24320_1697.N1	25-OCT-2006 02:37:32	Bright	29.000	68	18Alp Cas	2.2250	4500.0	58	24320	No
13	GOM_TRA_1PNPDE20061025_023848_000000292052_00218_24320_1698.N1	25-OCT-2006 02:38:48	Bright	29.000	76	27Gam Cas	2.3000	30000.	58	24320	No
14	GOM_TRA_1PNPDE20061025_024647_000000282052_00218_24320_1699.N1	25-OCT-2006 02:46:47	Bright	28.000	49	1Alp UMi	1.9900	6300.0	56	24320	Yes
15	GOM_TRA_1PNPDE20061025_025016_000000322052_00218_24320_1700.N1	25-OCT-2006 02:50:16	Bright	32.000	60	7Bet UMi	2.0810	3950.0	64	24320	No
16	GOM_TRA_1PNPDE20061025_025501_000000332052_00218_24320_1701.N1	25-OCT-2006 02:55:01	Bright	33.000	36	50Alp UMa	1.8000	6300.0	66	24320	No
17	GOM_TRA_1PNPDE20061025_025615_000000312052_00218_24320_1702.N1	25-OCT-2006 02:56:15	Bright	31.000	32	77Eps UMa	1.7630	11000.	62	24320	No
18	GOM_TRA_1PNPDE20061025_030008_000000292052_00218_24320_1703.N1	25-OCT-2006 03:00:08	Bright	29.000	174	52Psi UMa	3.0040	4400.0	58	24320	No
19	GOM_TRA_1PNPDE20061025_030711_000000292052_00218_24320_1704.N1	25-OCT-2006 03:07:11	Bright	29.000	96	68Del Leo	2.5600	9300.0	58	24320	No

3. Plot of GOMOS spectrometers and photometers temperatures from level 1b data

qds_image

4. Overview of dark signal processing per product

The Dark Charge (DC) is a temperature-dependant signal added to the useful measurements and it is therefore substracted
from them during the processing. There are two phenomena that produce a continuous increase of the DC: the "hot pixels"
(a pixel is "hot" when its DC exceeds by a significant amount its value measured on ground at the same temperature) and
the "Random Telegraphic Signal" (abrupt change positive or negative of the CCD pixel signal, random in time, affecting
only the DC part of the signal and not the photon generated signal).
In this section a list of products that did not use the Dark Sky Area (DSA) observation for the DC computation is given.
It is also provided the mean DC plot per product for dark limb products with no error flag set.

4.1 All products used the DSA observation for the DC computation

4.2 Plot of mean dark charges per product: only products in DARK limb conditions without errors are used

5. Demodulation flag and quality information monitoring

In this section it is presented the modulation information extracted from the pcd (product confidence data)
at measurement level and information extracted from the Quality Summary dataset. Only products without errors
(error flag in the MPH set to "0") are used.

5.1 Percentage of products during reporting period with:


At least one measurement with demodulation flag set:	23.5294 %
Reference spectrum computed from DB:	0.00000 %
Reference spectrum with small number of measurements:	0.00000 %
SATU data not used:	0.00000 %

5.2 Plot quality information per product (time dependant)

5.3 Plot quality information per product (world map)

6. Statistics and plot of tangent altitude of the last measurement (DARK & BRIGHT products without errors)

6.1 Statistics on tangent altitude lost:

Statistics	DARK	BRIGHT	TWILIGHT
Mean:	15.324	21.269	NaN
St. deviation:	5.7560	3.5152	NaN
Maximum:	19.773	25.855	NaN
Minimum:	7.6645	15.795	NaN
Number of data:	4.0000	11.000	NaN

6.2 Plot for DARK limb products

6.3 Plot for BRIGHT limb products

7. Star Acquisition and Tracking Unit (SATU)

The Star Acquisition and Tracking Unit (SATU) analyses the position of the tracked star beam collected by
the GOMOS telescope and deflected by the optical beam dispatcher. The main functin of the SATU is to detect
a star, provide its image position to the science data electronics and to help the pointing function to keep
the star image at a fixed position. In tracking mode the SATU data is recorded with a frecuency of 100 Hz.

7.1 SATU 'X' and 'Y' axis plots (dark limb)

SATU CCD 'X' and 'Y' axis plots are provided in order to detect any abnormal behaviour of the tracking system.
For every occultation (color) the plot should remain stable (with some noise) until we are deep in the atmosphere
where big fluctuations are registered due to the refractive effects.

qds_image

7.2 Statistics on SATU Noise Equivalent Angle (NEA) for DARK (D) and BRIGHT (B) products above 105 kms

The Star Acquisition and Tracking Unit (it is the CCD that tracks the star while it is occulted) Noise Equivalent
Angle consists of the statistical angular variation of the SATU data above the atmosphere.
Statistics (in microradians) above 105 km are computed for every occultation, giving four values per occultation: one in the 'X'
direction and one in the 'Y' direction for dark and bright limbs. A mean value per day in every direction and limb
is calculated and monitored in order to assess instrument performance in terms of star pointing.

7.2.1 SATU NEA Statistics (table)

Statistics	SATU X (D)	SATU Y (D)	SATU X (B)	SATU Y (B)
Mean:	0.076743	-0.93910	-0.020176	-1.7352
St. deviation:	0.39079	1.8163	0.67869	1.9825
Maximum:	1.6000	3.6000	5.2000	4.8000
Minimum:	-1.2000	-6.4000	-3.8000	-5.9000
Number of data:	1450.0	1450.0	2950.0	2950.0

7.2.2 Trend of daily SATU NEA St. deviation since 1st April 2006 (dark limb)

The long term trend of the SATU 'X' and 'Y' standard deviations should be constant during the whole mission.

qds_image

8. Auxiliary Data Files used for the production reported in section 2.2

The number reported in the third column indicates since which file (see list in section 2.2) the corresponding
auxiliary file has been used. The fourth column is the date of those product files.

Type	Auxiliary Filename	Used since product	Used since product date
INST_PHYS_CHARACTERISTICS	GOM_INS_AXNIEC20050627_150713_20030716_120000_20100101_000000	1	25-OCT-2006 00:05:36
CALIBRATION_DATABASE	GOM_CAL_AXVIEC20061020_081026_20061018_000000_20100101_000000	1	25-OCT-2006 00:05:36
LEVEL-1B_PROC_CONFIG	GOM_PR1_AXNIEC20050627_151042_20020301_000000_20100101_000000	1	25-OCT-2006 00:05:36
STAR_CATALOGUE	GOM_CAT_AXVIEC20020121_161009_20020101_000000_20200101_000000	1	25-OCT-2006 00:05:36
STELLAR_SPECTRA_DATABANK	GOM_STS_AXNIEC20040308_103538_20020101_160000_20100101_000000	1	25-OCT-2006 00:05:36
ECMWF_FILE	AUX_ECF_AXNECM20061024_062403_20061024_210000_20061025_090000	1	25-OCT-2006 00:05:36
OPTIONAL_ECMWF_FILE	MISSING	1	25-OCT-2006 00:05:36
ORBIT_DATA_FILE	AUX_FPO_AXVPDS20061025_001557_20061024_190713_20061103_203326	1	25-OCT-2006 00:05:36
ORBIT_DATA_FILE	DOR_NAV_0PNPDE20061024_224541_000057382052_00216_24318_0825.N1	5	25-OCT-2006 00:35:53

Reports

Daily Report Level 2 Dataset IPF v6.01

Daily Reports of NRT data

Data Anomaly Reports

Instrument Anomaly Reports

Monthly Reports

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Last modified:
24-Apr-2008