General Monitoring: PWV monitor
mirror sites: PL (internal link) HQ     [?]

General Monitoring: PWV monitor

 

CAL | HC | refs | QC
HealthCheck Monitor
   HOME | UsersGuide
  sl icon ALL INSTRUMENTS
 
FULL reports
QC links:
        [page auto-refreshes after 300 sec]   [stop | on]            [press Ctrl+Shift+R to enforce refresh of scores, dates and news]
PWV monitor  
Last update: 2016-02-14T05:03:47 (UT)
  | now: 2016-02-14T05:16:11 (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 the LHATPRO radiometer, and from XSHOOTER and UVES telluric absorption line equivalent widths. [contact: rhanusch@eso.org]

scores&comments | history ... | plot tutorial: n/a | contact               [?]
*Date on this monitor changes at 21:00 UT
Print: Information and research:
- png file - advanced studies: QC1 browser | QC1 plotter
Plot
?
Symb
?
Source
*
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 LOCAL none   mm none  39994 PWV n/a PWV (in mm) of atmosphere above Paranal
a) Radiometer (LHATPRO) data
1 QC1DB none   mm none  176 PWV this | last_yr | all PWV (in mm) of atmosphere above Paranal.
b) PWV from XSHOOTER telluric standard stars
1 ΔQC1DB none   mm none  10 PWV this | last_yr | all c) same, from UVES standard star equivalent widths
1 QC1DB none   mm none  0 PWV this | last_yr | all d) PWV as read from VISIR headers, based on LHATPRO data

2 LOCAL none   mm none  39994 PWV n/a same as plot no. 1, zoom in to lowest 5 mm.
a) LHATPRO data
2 QC1DB none   mm none  176 PWV this | last_yr | all same as plot no. 1, zoom in to lowest 5 mm.
b) XSHOOTER
2 ΔQC1DB none   mm none  10 PWV this | last_yr | all c) UVES
2 QC1DB none   mm none  0 PWV this | last_yr | all d) PWV as read from VISIR headers, based on LHATPRO data
*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:176
[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:176
[click on plot for closeup]
This plot

This plot displays PWV values for Paeranal, from radiometer (LHATPRO) data, and from UVES and X-SHOOTER standard stars. Since April 2015 the LHATPRO data are available in the ambient database, retrieved from there and displayed here. Until 2013-12-12, there were also data from CRIRES emission line fits.

Before the availability of the LHATPRO data (April 2015), the standard star measurements of UVES and XSHOOTER have been used as an approximation for the PWV values. 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.

Since 2015, the values from the radiometer LHATPRO on Paranal are written into the headers of VISIR science and STD star files, as keys TEL.AMBI.IWV.START and TEL.AMBI.IWV.END. They are extracted and also plotted here, to mark the epochs when VISIR actually used the prevailing PWV conditions.

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. Explore the PWV history under the link 'history'.
 


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