12th WMO International Pyrheliometer Comparison IPC-XII -- Information for Participants

Weather and Climate

PMOD/WRC is situated in an alpine valley at 1580 meters (5200 ft) above sea level. The average temperature in October is 5.6 °C (42.1 °F). On a clear-sky day the temperature may vary between 5 °C (41 °F) in the early morning to above 20 °C (68 °F) in the afternoon. On cold days there can be snowfall.

Getting to Davos

Zurich (Zürich Flughafen) is the nearest international airport. From Zürich Flughafen to Davos we suggest you travel by train, which is quite easy and reliable. All trains run on a regular schedule which repeats every hour, sometimes every 30 minutes. You will have to change trains at Zürich HB (Zurich main station) and Landquart. Occasionally an additional change of trains at Klosters Platz is required. If you stay at Hotel Seehof you want to travel as far as Davos Dorf station, which is located ~300 m from the hotel (see map below). The entire trip from Zürich Flughafen to Davos Dorf takes 2 hours and 37 minutes (43 minutes with the additional change at Klosters Platz). You can find your most convenient connections using the timetable app on the right, which will take you to the Swiss Federal Railway web site where you can also buy tickets or travel passes. Ticket vending machines are also available at the airport (by the luggage belt). Alternatively you can use the ticket counter in the airport train station. Follow the blue -signs after clearing customs. The single fare from Zürich Flughafen to Davos Dorf in 2nd class is 60.- Swiss Francs. Tickets are neither train- nor train-type-specific and can be used on any connection within the specified period of validity (usually 1 day). Seat reservation or advanced booking is not normally necessary.


To: Davos Dorf

Accommodation and Venue

The IPC-XII will take place at the PMOD/WRC institute, which is located about 700 m from Hotel Seehof (10-minute walk). The institute will be open on Saturday, September 26 and Sunday and September 27 from 10:00 to 16:00. From 16:30 until 18:00 on Sunday the IPC-XII registration desk will be open at Hotel Seehof, where a small welcome reception will be held at 17:00. The official start of the IPC-XII will be on Monday, September 28, 08:30 at PMOD/WRC.

Please inform Seraina (seraina.egartner@pmodwrc.ch) or the Hotel Seehof if you request any special or ethnic diet.

Davos Dorf, Seehof, PMOD/WRC

Organization of the Irradiance Measurements and Symposium

The measurement will be taken in series of 19.5 minutes duration, re-starting every 30 minutes. The starting time of the series is defined as the time of the first irradiance measurement. Self-calibration sequences or closed measurements should be completed before the starting time of the series. The measurement cadence is one irradiance reading per 90 seconds, resulting in 14 irradiance values per series. Please configure your pyrheliometers and/or data acquisition systems to run with this cadence or any integer fraction of it.

As an example, if the series starting time is announced at 09:18, make sure to complete any preparatory sequence in time to take irradiance readings at 09:18:00, 09:19:30, 09:21:00, 09:22:30, 09:24:00, 09.25:30, 09:27:00, 09:28:30, 09:30:00, 09:31:30, 09:33:00, 09:34:30, 09:36:00, and 09:37:30, or any suitable subset of these times. The next following series will then start at 09:48. All times are CET (central european standard time), which is one hour behind the local time.

All submitted data will be evaluated every evening and the preliminary results will be displayed in a dedicated data center room at Hotel Seehof, where also the programme for the next day will be posted. On sunny days (including weekends), we will start measurements around 08:00 CET (09:00 local time) and continue until sunset shortly after 16:00 CET (17:00 local time). On overcast/rainy/snowy days we will hold the IPC-XII Symposium at PMOD/WRC. No symposium will be held on weekends.

Each participant will be assigned indoor shelf space for storage and outdoor working space for installing his or her equipment including a table-top solar tracker during measurements. 230V 50Hz electricity will be available at each working space. Additionally 6V= will be provided for Ångström operators. 110V 60Hz can be provided upon request. Requests for additional space (e.g. for a tripod) or special electricity requirements should be sent to Ricco (ricco.soder@pmodwrc.ch), if not already indicated on the registration form. Wireless internet access will be available throughout the institute and measurement field.

Data Submission

Participants will have to bring all equipment necessary to take irradiance measurements, including voltmeters and solar trackers. The measurement data can be submitted either as raw voltages or irradiance values.

Raw voltage readings have to be typed into a java-based web interface. A laptop computer will be provided to those participants who have requested one on the registration form. If you plan to use your own computer to connect to the data submission interface make sure you have java installed and the appropriate user rights to accept non-certified java applications to run on your computer.

Automated data acquisition systems are required to produce data files according to the file format definition. Only one instrument per file is acceptable. The data files can be up-loaded to a dedicated directory on the PMOD/WRC ftp-server at any time. The directory path will be communicated in due time.

For pyrgeometers and filter-radiometers which participate in the IPgC-II and FRC-IV respectively, special arrangements for data acquisition will be available. Please contact Julian (julian.groebner@pmodwrc.ch) or Stelios (stelios.kazadzis@pmodwrc.ch) for all technical details regarding the IPgC-II and FRC-IV.