These are the news starting 01 Jan 2017
Click here for the news of the previous years.

24 Mar 17 There was a bettering with the daily CO2 swing, but I am still not satisfied: there seems to be a problem with the inlet air. I checked all pumps and tubes, found nothing suspicious. As a kludgy test, the glass cover from the inlet filter has been removed and the filter fixed by a wire, so that the sample air will come through the open window, and not through the normal inlet and manifold. Let's see if there is a change...
19 Mar 17 There really seems to be a problem with the CO2 sensor, as the readings are more or less flat, without the usual peak during the morning hours. Solution hopefully during the TSE maintenance scheduled for 31 March.
18 Mar 17 1. The NOx/NO sensor has a fatal breakdown (motor failure during the 13th March). Repair will be made at the end of March during the next big maintenance by T.S.E. The live data icon will be labelled with "No data".

2. CO2 sensor: no visible fault detected. Made new zero & span calibration (08:45). Will keep an eye on this sensor.
17 Mar 17 1. There was a bug in the main command file making the half-hour ftp transfers (one "bye" too many). The consequence ^was that the meteolcd app (IOS, Android) did not receive its data, and correctly reported "Out of Service". The problem has been corrected today at 14:00. I apologize, and my face is red :-(((!
2. A second, independent problem seems to hamper the NOx measurements (since 13/03) and the CO2 measurements (since today 10:00 UTC). I will check this asap.
15 Mar 17 A major change is made at the computing infrastructure: the old faithful Fujitsu-Siemens FSC E600 computer running OpenSuSE 11.2 is replaced by a slick refurbished HP T610 thin client, running LUBUNTU 16.04 and having no moving parts (passive cooling).

The T610 has been bought used at eBAY, and fitted with a 32 GB Sata SSD; it holds 4 GB Ram. New versions of all software have been installed, with a silly problem with GNUPLOT 5.0  crashing ImageMagick (an uncorrected change of a set command from version 4.2 to 5.0 created a header in the png file which was unacceptable to ImageMagick).

The installation was made from 08:30 to 09:10; please expect some disruption and possible some teething problems....

The picture shows upper left one of the older SUMICOM computers (retrieving the radioactivity readings), upper right a HP Thin client T5370 (with XPe) which handles the datalogger and lower right the new HP T610 with Lubuntu which makes all the graphs and the transfers to 

06 Mar 17 Maintenance and calibration.
04 Mar 17 Upload of feb17.dat file into data archive.
02 Feb 17 Upload of jan17.dat file into data archive.
30 Jan 17 Re-check of CO2 and NOx calibration (08:00-08:40).
Uncorrectible offsets: NOx = 18 ug/m3  NO = 3 ug/m3
28 Jan 17 The trend analysis including the 2016 data is finished. There might be some future minor changes, as for instance the Hohenpeissenberg CO2 data for the full year 2016 are not yet available. Please tell me about eventual errors. The updated Excel file with the 2016 data is here.
27 Jan 17 Maintenance and calibration by T.S.E.
24 Jan 17 New intercomparison paper (pdf file) by F.Massen & M. Zimmer of the TOC Dobson measurements done at Diekirch and at the RMI of Uccle.
20 Jan 17 New additions to the "Trends" section: eff. UVBdose, UVAdose
09 Jan 17 New additions to the "Trends" section: ground ozone, rainfall, enthalpy, solar energy, sunshine hours.
02 Jan 17 In the "Trends" section, air temperature (including  DTR and DJF winter temperatures) is updated.
01 Jan 17 1. The usual dogs-dinner in the 7days plot due to Gnuplot problems with handling previous and new year (the logger files do not contain the year number). This will be self healing in the the next 7 days.
2. Added overplot of Uccle and Diekirch total ozone column measurements for 2016 (see Dobson page)
3. Upload dec16.dat and (= all 2016 .dat files concatenated with headers, and zipped) into data archive.
4. Made 2016_only.xls file with statistics, daily and monthly averages. Started work on "trends" page update (this will take some time...)


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