Oxford MIPAS meeting#112 (20 Feb 07)

Summary of the January Monthly Report

During January 2007 the MIPAS instrument performs extremely well, in fact we report only one instrument switch-off due to IDU error. However MIPAS was not operational from 22 Jan to 23 Jan due to a planned ENVISAT OCM.
The instrument planning for the reporting month is hereafter summarized:

- The instrument operates with the baseline planning (2*3 days in NOM + 2*3 days in UTLS1
- In flight calibrations (IF9, IF10, IF11, IF16) were planned on 9-10 January (orbits #25414-25427)

All the planned measurements were acquired; in particular IF-16 measurements were correctly acquired in RAW mode.
The instrument duty cycle during the reporting month was 48.36%, in line with the recommendation of Science Team and industry. The availability of the instrument was high (98.6% of the planned time) owing to the very good performance of the INT. The measurement segments not processed to L0 due to failures at the PDS were about 3.2% of the planned measurement time (see § 2.2.4).
The monthly monitoring of the instrument temperatures shows a steady situation. Temperature variations are within 1-2K over the entire month (see § 2.3.1).
The long term monitoring of ADC max counts in channel A1 shows a strong correlation with the instrument self-emission and with the decontamination events. During the reporting month a slight decrease of ADC max counts is observed linked to the seasonal variation of instrument temperature (see § 2.3.2).
The cooler perform really well during this month, the vibrations being always well below the warning level of 8 mg (see § 2.3.3.1).
The long term monitoring of the spectral correction factor shows a stable situation since the variations are of the order of 3 ppm over almost two years of operations, furthermore the variations are mostly due to noise (see § 2.4.2).
The gain weekly increase during the reporting month is nominal, the maximum of gain increase in the band A remains well below the acceptance criterion of 1% (see § 2.4.3.1).
The analysis of the accumulated gain shows a slow increase of the gain with a constant rate and highlights the decontamination events throughout the mission (see § 2.4.3.2).
The absolute mispointing error is stable around a value of -20mdeg, the seasonal variation of the pointing error are small and below the fixed threshold of 8mdeg. During the reporting period a significant change in the pointing error was observed, the absolute error computed for the LOS calibration of 20th January is -30mdeg.
The long term monitoring of fringe count errors (FCE) for the RR mission was investigated this month. A statistical analysis was suggested during QWG#11 and is going to be implemented, results will be included in the next MR after discussion during the QWG#12 (see § 2.4.5.1).
The long term monitoring of the detected spikes is reported in this MR. The presence of spikes on the scene IGM is detected by the L1 processor, these spikes are corrected in order to avoid artefacts in the spectrum. The number of spikes is increasing since June 2006 in channels A1, A2, B1 and B2. In the last three months this trend seems to be more pronounced. The channels C and D (the detector most affected by spikes) didn’t show any trend so far (see § 2.4.5.2).
The level 0 NRT daily reports can be accessed at the following address:

http://earth.esa.int/pcs/envisat/mipas/reports/daily/Level_0_NRT/

The level 1b OFL daily reports can be accessed at the following address:

http://earth.esa.int/pcs/envisat/mipas/reports/daily/Level_1_OFL/

Oxford MIPAS meeting#112 20 February 07

Summary of the January Monthly Report

Oxford MIPAS meeting#112
20 February 07