| Start Date | Start Time | End Date | End Time | Data Quality Metric |
|---|---|---|---|---|
| 07/06/2005 | 0000 | 08/06/2005 | 2359 | Does not affect quality |
| Subject: | SGP/AERI/C1 - Sampling rate changes |
| DataStreams: | sgpaeriengineerC1.b1, sgpaerich1C1.b1, sgpaerisummaryC1.b1, sgpaerich2C1.b1 |
| Description: | The sampling rate of the SGP.C1 AERI was changed 4 times during July and August 2005. Data quality is not affected but faster sampling rate means that less scans are co-added and the signal-to-noise ratio of the spectral data will be different. The C1 scan rate was increased to rapid sampling mode to support efforts at the SGP. However, a hard drive failure occurred during rapid sampling. A second hard drive was installed. We tested the new drive to make sure there was no problem by running the system at regular sampling speed. There were no problems so the AERI sampling rate was increased to rapid sampling mode. However, during observation, it was noted that the computer and hard drive could not keep up with the rapid sampling rate and the spectral data badly lagged the summary files, usually by 8 spectra. This lag time could have caused hard drive corruption because files were still being written when the system was trying to restart at 00:00 GMT. The solution to the problem was to increase the sampling rate. The sampling rates are listed below. February 10 2005-July 5 2005 Blackbodies 46 coadds each, Sky view 90 coadds July 6 2005 - July 22 2005 Blackbodies and Sky view 6 coadds each July 23 2005 - July 28 2005 hard drive failure, no data July 29 2005 - August 5 2005 Blackbodies 46 coadds each, Sky view 90 coadds August 6 2005 - present Blackbodies and Sky view 12 coadds each Dr. David Turner is preparing a VAP to reduce instrument noise when rapid sampling to the noise level of normal sampling. This VAP should correct the problem. |
| Suggestions: | |
| Measurements: | sgpaerisummaryC1.b1: more
sgpaerich1C1.b1: more sgpaerich2C1.b1: more sgpaeriengineerC1.b1: more |