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VISIR trending system: HISTORY plot |
Last update: 2009-01-29T09:14:19 (UT)
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*Date on this monitor changes at 21:00 UT |
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Plot ? |
Symb ? |
Source * |
Average ? |
Thresholds ? |
N_ data |
QC1 parameter |
Data downloads |
Remarks |
method |
value |
unit |
method |
value |
1 |
| QC1DB |
MEAN |
-1121.67651 |
mJy/1hr |
3SIG | ± 9597.75293 |
89 |
backgd_mean |
this |
last_yr |
all
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mean background for the SF, pfov=0.075 |
2 |
| QC1DB |
MEAN |
-3097.44775 |
mJy/1hr |
3SIG | ± 16478.06445 |
40 |
backgd_mean |
this |
last_yr |
all
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mean background for the IF, pfov=0.127 |
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*Data sources: QC1DB: QC1 database; LOCAL: local text file
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This plot
Historical mean background values from imaging standard star observations
using the pre-upgrade detector.
Only data taken with the PAH1 filter are selected. The plot is separated
into small-field (SF) pixel field of view (0.075 arcsec/pixel) and
intermediate-field (IF) pixel field of view (0.127 arcsec/pixel).
The background level is determined from the half-cycle
frames where no offset correction (32768 value added for each pixel)
was applied.
General information
Click on any of the plots to see a close-up version.
The latest date is indicated on top of the plot, data points belonging to that date are specially marked.
If configured,
- statistical averages are indicated by a solid line, and thresholds by broken lines
- outliers are marked by a red asterisk. They are defined as data points outside the
threshold lines
- "aliens" (= data points outside the plot Y limits) are marked by a red arrow (↑ or ↓)
- you can download the data for each parameter set if the 'Data downloads' link shows up
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