17 Jul 19
TB3H64Q Log image uploaded from Geocaching® app
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7 Jun 18
Polariscope This Savarts and Cornu Polariscope was used in the early 20th century at the Davos Observatory.
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7 Jun 18
Pyranometer Pyranometers are fairly common instruments measuring the global solar irradiance over a field of view of 180°. The instrument shown here has a ventilation and heating system attached underneath to allow for operation in harsh winter conditions.
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7 Jun 18
World Radiometric Reference (WRR) While measuring the total solar irradiance (TSI), ie. "how bright is the sun shining right now?", might sound like an easy task, it is not. The radiometers used for this task might deviate over time, or may be subject to other errors. This is why the World Radiometric Reference (WRR) was created, ensuring that measurements of the TSI are comparable over distance and time. The instruments shown here serve as world-wide reference, similar to the international kilogram prototype in Paris.
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7 Jun 18
CIMEL Sun Photometer The CIMEL Sun Photometer consists of a tube attached to a 2-axis mount. It then points to different points in the sky to measure solar irradiance at that point. The measurements are done at different, pre-determined wavelengths. They are being used to determine the Aerosol Optical Depth (AOD) of the atmosphere.
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7 Jun 18
Hefner Lamp Until the 1920s, luminosity was measured by the unit "Hefnerkerze" in Germany, Austria and Scandinavia. The device depicted here was the property of Carl Dorno, the founder of PMOD/WRC and one of the pioneers in researching ultraviolet radiation, sometimes referred to as "Dorno radiation" even today.
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7 Jun 18
CSAR Cryogenic Solar Absolute Radiometer The CSAR instrument consists of a vacuum tube which inside is being cooled down to near the absolute minimum temperature. This allows for very precise measurements of the total solar irradiance (TSI) at the earth's surface. This instrument is a prototype developed by PMOD/WRC in Davos, Switzerland in close collaboration with the National Physical Laboratory (NPL) in the UK and METAS in Switzerland.
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7 Jun 18
Precision Filter Radiometers Precision Filter Radiometers (PFRs) measure solar irradiance in a few very narrow spectral ranges. They are used for measuring the Aerosol-Optical Depth (AOD) of the earth's atmosphere. Desert dust, volcanic ashes as well as human-made particles all influence the AOD. Three of the instruments depicted here are referred to as the "Reference Triad" since they serve as the world-wide reference for their kind.
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7 Jun 18
Wetterradar des FMI in Luosto, Lappland Zwar gibt es an dieser Stelle keinen Cache, aber der Turm mit dem eindrücklichen Radom obendrauf ist für Windgeschwindigkeiten bis 50m/s ausgelegt. Der Radar erfasst Niederschläge in einem grossen Umkreis.
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7 Jun 18
Sodankylä Geophysical Observatory Nachdem der Coin mich nun schon viele Monate begleitet hat, lege ich ihn hier im hohen Norden ab. Dieses Observatorium wird primär von der Universität Oulu betrieben, aber auch andere Institutionen wie der Finnische Wetterdienst sind hier zu Hause.
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27 Mar 18
Dorno's UV Spectrometer in 1912 Right side of photo: Carl Dorno's UV Spectrometer on the rooftop of Villa Dora in Davos in the year 1912.
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27 Mar 18
Geocacher's Star on top of old UV Spectrograph Historic UV spectrograph used for measurements of UV radiation
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13 Feb 18
Geocacher's Star on top of a space experiment
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16 Jan 18
Star in front of Chateau de Chillon (3)
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16 Jan 18
Star in front of Chateau de Chillon (2)
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16 Jan 18
Star in front of Chateau de Chillon
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16 Jan 18
Geocacher's Star in Valais/Sion
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21 Nov 17
Historical sign of SFI The "Schweizerisches Forschungsinstitut für Hochgebirgsklima und Medizin in Davos" was founded in 1922 and consists of two research institutions, of which PMOD/WRC ("Observatorium") is one.
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21 Nov 17
PMOD/WRC Geocacher's Star Geocoin in front of the PMOD/WRC sign at the building entrance.
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18 Sep 17
Zu Besuch im im TB Hotel - Grosshus, Küblis Geocacher’s Star 2009 Geocoin in der Schweiz.
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