General Monitoring: PWV monitor
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General Monitoring: PWV monitor

 

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PWV monitor  
Last update: 2014-12-27T21:59:00 (UT)
  | now: 2014-12-27T22:28:23 (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 XSHOOTER and UVES telluric absorption line equivalent widths. [contact: rhanusch@eso.org]

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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 none   mm none  376 PWV this | last_yr | all PWV (in mm) of atmosphere above Paranal.
a) PWV from XSHOOTER telluric standard stars
1 ΔQC1DB none   mm none  13 PWV this | last_yr | all b) same, from UVES standard star equivalent widths
2 QC1DB none   mm none  376 PWV this | last_yr | all same as plot zoom in to lowest 5 mm.
a) XSHOOTER
2 ΔQC1DB none   mm none  13 PWV this | last_yr | all b) UVES
*Data sources: QC1DB: QC1 database; LOCAL: local data source
Plot 1
data source:ambient_PWV
(QC1 database)
dataset:
(numbers below apply to this dataset)
PWV
average:none
thresholds:none
N_data plotted:376
[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:376
[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.

If configured,

  • data points belonging to the latest date are specially marked
  • 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