General Monitoring: PWV monitor
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General Monitoring: PWV monitor

 

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PWV monitor  
Last update: 2014-09-19T21:58:50 (UT)
  | now: 2014-09-19T22:32:16 (UT)  
same group: PWV:_last_60d last_10d   PWV_forecast PWV_WLAMBDA PWV_fits_(calista)
General news:
Report news: This plot is updated once per hour, with the latest PWV results from CRIRES sky emission line fits, and from XSHOOTER and UVES telluric absorption line equivalent widths. VISIR data are not plotted here, see more in the documentation below.

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*Date on this monitor changes at 21:00 UT
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Plot
?
Symb
?
Source
*
OPS?
**
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB no none   mm none  171 PWV this | last_yr | all PWV (in mm) of atmosphere above Paranal.
a) PWV from XSHOOTER telluric standard stars
1 ΔQC1DB no none   mm none  27 PWV this | last_yr | all b) same, from UVES standard star equivalent widths
2 QC1DB no none   mm none  171 PWV this | last_yr | all same as plot zoom in to lowest 5 mm.
a) XSHOOTER
2 ΔQC1DB no none   mm none  27 PWV this | last_yr | all b) UVES
*Data sources: QC1DB: QC1 database; LOCAL: local text file | **OPS: OPSLOG data are included
Plot 1
data source:ambient_PWV
(QC1 database)
dataset:
(numbers below apply to this dataset)
PWV
average:none
thresholds:none
N_data plotted:171
[click on plot for closeup]
Plot 2
data source:ambient_PWV
(QC1 database)
dataset:
(numbers below apply to this dataset)
PWV
average:none
thresholds:none
N_data plotted:171
[click on plot for closeup]
This plot

This plot displays PWV values from XSHOOTER and UVES standard stars. Until 2013-12-12, there were also data from CRIRES emission line fits.

UVES has regular flux standard star measurements (usually at the begin of a night). The telluric absorption lines in the pipeline product RED_STD_REDL of the 860 setting are analyzed by a routine written by Reinhard Hanuschik. It calculates the equivalent width of the telluric absorption lines, and transforms these values into PWV values using a curve-of-growth. This method is called "WLAMBDA" in the QC1 database.

XSHOOTER takes every few hours a telluric standard star, in all three arms. The products from the VIS arm are analyzed in a way similar to UVES. The X-Shooter PWV values are also collected here.

All values are stored in a QC1 database table and plotted here. All routines (parser, standard star processing, plotter) are called once per hour. The plot is expected to be up-to-date within that time-scale, provided new input data are available. Usually the pipeline processing of the standard star data is also up-to-date within one hour. That part has been implemented by Reinhard Hanuschik.

Plot #2 is a closeup of plot #1, emphasizing data values below 5 mm.

 


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